Cold War Soviet Prototypes

1K17 Szhatie

Soviet Union (1990-92)
Self-Propelled Laser Complex – 1 prototype

The mysterious 1K17 Szhatie (also known as 1К17 Сжатие – ‘Compression’ in Russia, and as the ‘Stiletto’ in NATO reporting) was a unique project developed by the Soviets just before the collapse of the Soviet Union in 1991. This laser-armed tank was designed to be a type of anti-missile system. It could also disable enemy optoelectronic systems, including imaging equipment such as sights, scopes and cameras.

The 1K17 Szhatie. Photo: Vitaly V. Kuzmin


A laser-armed tank may seem like something out of Buck Rogers or Star Wars (the latter being popular at the time of the vehicle’s original conception), but this was a very real project. The idea for such a vehicle appeared in the late 1970s, early 1980s, in the form of the SLK 1K11 Stilet. This was a relatively simple vehicle, being little more than an APC with a small laser lamp on its roof.
A further development was the Sanguine, based on the ZSU-23-4 Shilka SPAAG (Self-Propelled Anti-Aircraft Gun) with a large single laser emitter mounted in place of the guns. Little is known about the trials and success or failure of these projects. There is information to suggest that during testing that the Sanguine’s laser once knocked out a helicopter’s optical system at a range of 6 miles (9.65 km) and disabled the aircraft entirely at 5 miles (8.04 km).
The project would be revisited in the late 80s, with a more elaborate design. This Self-Propelled Laser Complex (S.P.L.C.) was designed by Nikolai Dmitrievich Ustinov. Ustinov was a scientist, radiophysicist and radio technician, but specialized in laser technologies. He was even the head of a school dedicated to laser technology. The vehicle was constructed at Uraltransmash (The Ural Transport Machine-Building Plant) in Yekaterinburg, under the supervision of Head Designer, Yuri Vasilyevich Tomashov.
The first prototype of the vehicle was assembled in December 1990. In 1991, 1Q17, as it was then designated, took part in field trials which lasted until 1992. The trials were considered a success, and the S.P.L.C. was approved for construction and service, though Mr. Ustinov, unfortunately, would not live to see it, as he passed away in 1992. For a variety of reasons, it would never see service or full-scale production.

A Design From the Future

The 1K17 was based on the chassis of the 2S19 ‘Msta-S’ Self-Propelled Howitzer. The gun was removed from the 2S19’s turret and it was heavily modified. The ’Solid-State’ Laser equipment was introduced into the subsequent void left by the gun. Solid-State is a type of laser that uses a solid focusing medium, as opposed to the liquid or gas of most common high-power beam emitters.
The project soon became an extremely expensive endeavor, as the solid medium of choice for this extremely powerful laser was artificially grown rubies, each one weighing 30 kg. (66.1 lb). There were 13 laser tubes in the emitter, each one filled by a ruby. The ruby crystal was formed in the shape of a cylinder. After it was harvested, the ends were polished and covered with silver which acted as focusing mirrors. In operation, Xenon gas would spiral around the ruby. The luminescent gas was ignited by lamps in the crystal housing, which would, in turn, ignite the laser beam. The range of the beam is not known, but it is probably similar to that of the Sanguine’s; 5 – 6 miles (8.04 – 9.65 km).
It is also estimated that the laser had a pulse mode that was achieved with an aluminum-garnet device that had neodymium additives. This gave off large amounts of power in short bursts and would give the laser a pulsing effect.

A Dangerous Weapon?

As a defensive weapon, the laser was extremely effective in disabling enemy vehicles, weapons and visual equipment. It could also be used an offensive weapon, against biological targets such as humans, either pilots, crew, or infantry etc. Much of the information available regarding the effect of lasers on humans come from small-scale tests. The source for the subsequent info comes from a recording of such tests, in the book Effects of High-Power Laser Radiation by John F. Ready.
As described previously the system could disable enemy equipment. The prototype built on the Shilka is recorded as having downed a helicopter during testing. A laser this size and radiation output could easily cause computer systems to shut down. Plastics and thin metals would likely melt or warp, ruining structural integrity.
With regards to biological effects, it is well known that even pocket lasers and small-scale lasers can cause damage to the human eye with heavy retinal burns and scarring. This can result in complete blindness. This effect would be amplified due to the size and power of the 1K17’s laser system, probably resulting in instant blinding. It isn’t known to be the case, but it is likely that that the entire crew of the vehicle wore eye protection in the form of tinted goggles matched to the frequency of the light emitted. These are used in most cases when handing lasers outside of military use. The crew of any enemy vehicle looking through a telescope or gun sight would likely be blinded.
Here marks a controversial point where this weapon, if it had entered service and was used in such a fashion, would breach Geneva Convention protocols. Below is article one to three from the Convention’s Blinding Laser Weaponry protocol which was put forward by the United Nations on October 13, 1995. It came into force July 30th, 1998:
Article 1: It is prohibited to employ laser weapons specifically designed, as their sole combat function or as one of their combat functions, to cause permanent blindness to unenhanced vision, that is to the naked eye or to the eye with corrective eyesight devices. The High Contracting Parties shall not transfer such weapons to any State or non-State entity.
Article 2: In the employment of laser systems, the High Contracting Parties shall take all feasible precautions to avoid the incidence of permanent blindness to unenhanced vision. Such precautions shall include training of their armed forces and other practical measures.
Article 3: Blinding as an incidental or collateral effect of the legitimate military employment of laser systems, including laser systems used against optical equipment, is not covered by the prohibition of this Protocol.

A close-up view of the emitter set up. Photo: Vitaly V. KuzminReactions of skin and other bodily tissue is a different matter. The effect of laser radiation varies between the skin tones and keratin levels, but overall results are similar. With a high-power laser emitting at lower levels, lesions and dead skin begin to appear. With increased power, the damage worsens. Severe burns can occur with damage to blood vessels, leading to heavy charring and necrosis. Internal organs can also be badly damaged, especially the brain if the head is fully exposed. Death can occur with exposure to the brain by causing deep lesions and extreme hemorrhaging. One should remember, that effects described here would be amplified greatly due to the size and power of the 1K17’s emitter. It may not have been designed to be offensive, but it could certainly be a dangerous weapon if deployed in such a manner.


The turret of the 1K17 was extremely large, being almost as long as the hull, housed the huge laser emitter. There were 13 lenses in the emitter, these were mounted in two rows of six, with one lens in the center. When not in use, the lenses were covered by armored panels. It is unknown to what degree – if any – the emitter can elevate or depress, though there is what appears to be pivot points either side of the emitter housing. Also, given that one of the laser’s intentions was to disable incoming missiles, it is likely that it can elevate to aim at airborne targets.

This view of the emitter shows the armored panels that cover the lenses when not in use. Photo: Vitaly V. Kuzmin
The rear of the turret was taken up by a large autonomous auxiliary generator unit that would provide power to the emitter. Towards the rear of the turret on the right was a cupola for the commander, mounted on here was a 12.7mm NSVT Heavy Machine Gun for self-defense. Aside from this, the tank had no other regular, that is to say ballistic, weaponry to fall back on in a defensive situation apart from any personal weapons the crew might carry. It also had six smoke dischargers. These were mounted in two banks of three on either side of the emitter on the turret cheeks.


As mentioned, this vehicle was based on the design of the 2S19 SPG, which in turn was based on the hull of the T-80 Main Battle Tank. The chassis of which was mostly unaltered apart from being lengthened slightly for improved stability. It was powered by the T-72’s V-84A Diesel engine, rated at 840 hp. This gave the SPG a speed of 37 mph (60 km/h). The driver’s position was in the center, at the front of the vehicle.

A full view of the 1K17’s hull and turret. Photo: Vitaly V. Kuzmin


The turbulent economic wake of the USSR’s disintegration in 1989, with revisions to the state’s financing of defense programs, was the death warrant for the 1K17 project. Only one vehicle was built. Its existence was only recently revealed, and the exact properties of the laser system remain classified, with no open source of data. The number of crew that operated the vehicle is even unknown.
The 1K17 does survive, however. It is preserved and displayed at the Military Technical Museum at Ivanovskaya, near Moscow. It is unclear what happened to the Stilet and Sanguine. The Stilet was photographed in 2004, at a military scrap yard near St. Petersburg. It has not been seen since.
At this time the status of Russian laser weapons development is not known but there is no information to suggest that such weapons are not currently in development although none are known to have ever been operationally deployed. The Szhatie was not the last Russian ‘laser tank’, however. Though it does not operate in the same manner, the KDHR-1H Dal (meaning ‘Distance’) is a chemical detection and monitoring vehicle and is equipped with a laser radar that can scan 45 square miles in 60 seconds. This vehicle is currently in service with the Russian Military.

An article by Mark Nash

1K17 Szhatie specifications

Dimensions (L-W-H) 19.8 x 11.7 x 11 ft (6.03 x 3.56 x 3.3 m)
Total weight, battle ready 41 tons
Crew Unknown other than Commander and Driver
Propulsion V-84A Diesel engine, 840 hp
Speed (on/off road) 37.2 mph (60 km/h)
Armament 1 high-power laser complex, 15 seperate lenses,
1 x 12.7mm NSVT Heavy Machine Gun
Total production 1
For information about abbreviations check the Lexical Index


John F. Ready, Effects of High-Power Laser Radiation, Academic Press
An article on the 1K17
An article on (Russian)
The 1K17 on
An article on Self-Propelled Lasers
A full collection of 1K17 images on Vitaly V. Kuzmin’s website,

Illustration of the 1K17 Szhatie by Tanks Encyclopedia’s own David Bocquelet. (Click to enlarge)

Cold War Soviet Prototypes Prototypes

IS-7 (Object 260)

Soviet Union (1946-48)
Heavy Tank – 7 prototypes

The IS-7 (ИC-7), starting life under the project title of Object 260 (объект 260), followed on from the ill-fated IS-5 (Object 730) and IS-6 (Object 252/253). With these failures, the request was still standing for the USSR’s next heavy tank.
The IS-7 was the brain-child of the Soviet tank designer Nikolai Fedorovich Shashmurin. As well as having a hand in the design of the rather successful IS-2 which would serve well in the later years of World War II, Shashmurin also drew up plans for the ill-fated KV-4 (Object 906) project, which never came to fruition.
The IS-7 would be Shashmurin’s crowning glory and could be considered the zenith of the Iosif Stalin heavy tanks. At the time of its conception, it was one of the most technologically advanced heavy tanks in the world, and one of the most heavily armored.


The seeds of the IS-7 were first sown in December 1945 in Factory No. 100 in Leningrad, with a full-scale wooden mock-up produced soon after. Running prototypes were ready for testing in 1946. These tests ran through 1947, ending in 1948 when the designers believed they had reached a finalized design. It was then given the title of IS-7. This final design was armed with a stabilized 130 mm (5.12 in) cannon fed by an autoloader, a total of 8 machine guns, infrared scopes, and armor up to 300 mm (11.8 in) thick. It was the largest tank that the USSR had or would ever produce.
The wooden mockup of the IS-7, at this point known as the Object 260
The wooden mockup of the IS-7, at this point known as the Object 260


The tank was designed to withstand the impact of a shell fired by the 12.8 cm Pak 44 Gun found on the German Jagdtiger. The armor on the IS-7 was up to 300 mm (11.8 in) thick, some of the thickest being found on the specific pike nose, formed from homogenous steel. The upper plates were 150 mm (5.9 in) thick angled at 60 degrees. The lower glacis 100-120 mm (3.94-4.72 in) with a slight angle.
Rear cutaway view of the IS-7. Note the thicknesses of the armor on the turret and hull sides.
Rear cutaway view of the IS-7. Note the thicknesses of the armor on the turret and hull sides.
The side armor was also not to be underestimated. The upper hull was 150 mm (5.9 in) thick, while the lower sides measured 100 mm (3.94 in) and was curved outwards, meeting the upper hull seamlessly. The bending of the lower hull was done in a large press, which literally forced the metal into shape.
The mantlet was 350 mm (13.8 in) thick. The turret itself was cast, with the cheeks being the thickest part at 240-250 mm (9.45-9.84 in). They were angled, or curved, at about 50-60 degrees. The shape of the turret was extremely rounded and smooth all the way around, with no obvious shot traps or prominent cupola. There were slightly raised portions of the turret roof where crew positions were found. The commander’s station on the right was slightly higher than the gunner’s one found on the left. The top of these raised portions had direct vision blocks.
In a hull-down position, the turret would have been almost impenetrable. The armor proved not only immune to the intended 12.8 cm, but also the tank’s own 130 mm cannon.


The IS-7’s main armament consisted of the 130mm (5.11 in) S-70, although it was originally intended to carry the S-26. The S-70 was derived from a naval gun. It had a barrel length of 54 calibers. The gun could fire a 33.4 kg shell at 900 m/s and was able to penetrate up to 163 mm (6.4 in) of armor, sloped at 30 degrees, at ranges up to 2000 meters.
The 130 mm S-70 gun with the coaxial KVPT on top.
The 130 mm S-70 gun with the coaxial KVPT on top.
As mentioned above, the IS-7 was equipped with an autoloader. It is not an autoloader in the current sense of the word, however. A more accurate description would be an Automatic Loading Assistance Device, that would be operated by the tank’s two loaders. This piece of equipment was located in the turret bustle. The ammunition of the IS-7 was composed of two parts, separately loaded. As such, the charge was at the bottom of the device, while the projectile sat above. It was operated by a crank handle. The first turn would drop a projectile onto the conveyor belt located in the center of the system, a few more turns would drop the propellant behind. The conveyor would then carry the ammunition to the mouth of the breach, where it would be rammed in. The conveyor would then lift clear of the gun. The gun then fired and the process began again.
The IS-7s loading system
The IS-7s loading system.
This theoretically gave the tank a 6 to 8 rounds per minute rate of fire. Whether actual operation matched this time is unknown, as it doesn’t take into account the reloading of the device. However, it could technically be resupplied as it worked from the various ammunition racks inside the vehicle. The tank carried 25-30 rounds. The downside of this system was that the gun had to return to a neutral position for the loading device to work, meaning the gunner would have to re-lay the gun onto to a target after each shot. Should the mechanism go down, the gun could be manually loaded of course.
To say that the IS-7 was lacking in secondary armament would be an understatement of the highest order. The IS-7 was equipped with no less than 8 machineguns. Four of these were 7.62 mm (0.3 in) SGS-43s and they were mounted in a unique way. Two were placed on both flanks of the hull, towards the rear, fixed in place and fired by the driver. The machine guns were housed in a simple armored box. There were separate shoots for the spent casings and belt links. The ammunition was stored underneath.
There were two more of the machine guns fixed on the rear of the turret, facing backward. These two were staggered to accommodate the large ammunition shoots on the turret roof. Sheet metal boxes were attached to the outside of these to collect the belt links, but casings were left to fall away. It is believed these guns were operated by the gunner or loader who would take aiming orders from the commander to turn the turret left or right. The practical use of these weapons is highly questionable. Whether they would have stayed on a production model is unknown, but some of the prototypes were not equipped with the ones on the turret.
The roof was home to a 14.5 mm (0.57 in) KPVT heavy machine gun on an AA mounting that could pivot down to the left when not in use. The only way to operate this gun was by standing on the engine deck. There were tests to see if it could be remotely controlled by the commander, but these were unsuccessful.
The IS-7 had no less than 3 coaxial machine guns. As well as the KPVT mounted on top of the main armament, 2 SGS-43s were mounted either side of it.


The IS-7 was powered by the M-50T 12 cylinder diesel engine, rated at 1050 hp, and was derived from a naval marine engine. It would run through an 8-speed planetary gearbox. This would propel the vehicle to 60 km/h (33 mph) on roads, a respectable speed for a tank weighing 68 tons fully loaded. Spare diesel fuel could be stored in canvas pouches in compartments towards the rear of the vehicle on each flank.
The weight of the IS-7 was supported on 7 roadwheels on each side. These wheels also supported the return of the track, as there were no return rollers. Each wheel was attached to a road wheel arm, in turn, attached to the torsion bar suspension. The wheels had internal rubber bushings to give the all-metal wheels an extended service life.
The tracks of the IS-7 were some of the first in Soviet use to have a retaining clip in the track link pins, instead of having to rely on a wedge of metal welded to the lower hull to whack the pins back in.

Photo: – Alexey Khlopotov


After the initial factory tests, the prototype tanks were handed over to the State Commission. The test drivers were famously fond of how the IS-7 handled. Reporting that it would respond to the smallest adjustment with ease. The tests were not without incident, though.
During one of the trials, an IS-7 caught fire, despite both sets of internal extinguishers firing, the fire continued to burn resulting in the abandonment of the vehicle and its complete destruction. The cause of the fire was thought to have originated with the weight-saving plastic lined canvas fuel tanks. Quite understandably, these were deleted in later versions.
Though it was liked and generally thought to be a good vehicle, the governing bodies refused to accept it into mass production. The official reasons are not known as to it was rejected. As such, the IS-7 would never enter service, with its successor, the IS-8, later known as T-10, proving to be a more flexible vehicle and able to better meet the needs found on the now fast moving battlefields. It served from 1953 to 1996.
Only one IS-7, built in 1948, survives today and is currently on display at the Kubinka Tank Museum.
The IS-7 as it stands today in the Kubinka Tank Museum
The IS-7 as it stands today in the Kubinka Tank Museum, alongside the IS-4.

Planned Variants

Object 261

While work was ongoing with the IS-7, plans were drawn up for a self-propelled gun variant based on the IS-7’s hull. There were 3 planned versions, the Object 261-1, -2 and -3. The 261-1 was a closed type with the fighting compartment on the bow end of the vehicle. It was armed with a 152 mm (6 in) M-31 gun. The configuration was similar to the ISU series.
The 261-2 had a rear mounted open fighting compartment. For this version and the following, the chassis was reversed, meaning the drive wheels were now at the front of the vehicle. What was the IS-7’s front was the 261-2’s rear. It was armed with a long-barreled M-48 152 mm (6 in) gun. The Object 261-2 was later redesignated Object 262.
The 261-3 had the same configuration as the 261-2/262, but was up-gunned with the naval derived 180 mm (7.09 in) MU-1 gun, also known as the B-1-P. Despite them being Self Propelled Guns, designed to be behind the lines giving fire support, these vehicles were intended to be well armored, with armor 150 to 215 mm (5.91-8.46 in) thick. The vehicles didn’t go further than the scale model phase.
The small-scale mock-up of the Object 261-2/261-3
The small-scale mock-up of the Object 261-2/261-3. A Recoil-spade was also added to the rear.

Object 263

This was a tank destroyer variant, built on the same configuration to the 261. It had a rear mounted, semi-open fighting compartment. The main armament was the 130 mm (5.12 in) S-70A, with separately loading ammunition. This was a slightly modified version of the IS-7’s gun. The armor was up to 250 mm (9.84 in) thick, with a large, flat slab on the front of the vehicle, and two plates either side of the gun mantlet. The side armor was up to 70 mm (2.76 in).
As with the 261-2 and -3, the IS-7 chassis was reversed, a configuration similar to the British Archer. The driver was moved to the left of the gun. Whether the 263 would have had the same issue of the Archer’s engine heating the middle of the barrel and throwing off accuracy is unknown. Like the 261, the vehicle never went further than small scale models.
The small-scale mock-up of the Object 263
The small-scale mock-up of the Object 263. The 263 also saw the addition of a recoil-spade on the rear.

An article by Mark Nash

IS-7 (Object 260) specifications

Dimensions (L-W-H) 7.3 m x 3.3 m x 2.4 m (24ft 2in x 11ft 1in x 8ft 1in)
weight 68 tonnes
Crew 5 (driver, gunner, 2x loaders, commander)
Propulsion 1050 hp 12 cylinder M-50T diesel engine
Suspension Independant torsion bar
Speed (road) 60 km/h (33 mph)
Armament 130 mm (5.11 in) S-70
2x KPVT 14.5 (0.57) MGs
6x SGS 7.62 (0.3 in) MGs
Armor Hull: 150 mm (5.9 in, upper glacis, angled at 60 degrees) – 100-120mm (3.94-4.72 in, lower glacis). Side armor is 150 mm (5.9 in) – 100 mm (3.94 in).
Turret: 240-250 mm (9.45-9.84 in)
Total production 7 prototypes

Links & Resources

An article on the IS-7 on FTR
An article featuring the IS-7
The above link uses the following literature as the primary source: Heavy Soviet Post-War Tanks. Written by M. Baryatinsky, M. Kolomiets and A. Koschavtsev. “Armour Collection #3, 1996”
The IS-7 on (Czech)
The IS-7 on (Russian)
English translation of the article

Illustration of the IS-7 by Jarosław Janas
Illustration of the IS-7 by Jarosław Janas.

Illustration of the IS-7 by Tanks Encyclopedia’s own David Bocquelet.

Cold War Soviet Prototypes

Object 416 (SU-100M)

USSR (1950)
Light tank/SPG – 1 prototype built


Object 416 was born in the famous city of Kharkov. It was designed by The Construction Bureau of Plant No. 75. In 1944, the same design bureau had designed the A-44, a rear-turreted medium tank. The A-44 never saw development as a consequence of the ensuing Russo-German hostilities.
In 1950, the team started with a fresh blueprint, taking inspiration from their older design. The design was for a light tank with a low silhouette that would be well armored, but not overly heavy.


In 1951 the requirements for the project were altered. Due to its general characteristics, the vehicle was redesigned as a self-propelled/assault gun. Technical problems with the turret meant a working prototype was not ready until 1952. By 1953, the design had developed a little bit more, and had a properly functioning turret.
The Object 416 prototype in Kubinka. The low height of the vehicle can be observed. - Source:
The Object 416 prototype in Kubinka. The low height of the vehicle can be observed. – Source:
What came out of this was the Object 416, a lightweight vehicle with an extremely low profile and a rear mounted turret. The vehicle weighed just 24 tons, and was only 182.3 cm (5’2”) high. It was moderately armored with hull armor of only 75 mm (2.95 in) and frontal turret and mantlet armor of 110 mm (4.3 in).
The turret, though designed solely for this vehicle, shared a lot of features with the T-54’s, but was greatly expanded. It was abnormally large for a vehicle of its class and size, but for good reason. All 4 of the crew, including the driver, were positioned in the rear mounted turret. The driver sat at the front right. An ingenious system was developed, meant to allow the driver to remain facing towards the front of the vehicle regardless of where the turret was pointed. On paper, the turret was capable of a full 360 degrees of traverse, however, the driver’s seat would only rotate so far. This meant that the arc was reduced to 70 degrees left and right while the vehicle was on the move. The was also responsible for loading the 7.62 coaxial machine gun to his left.
The main armament of the 416 was the 100 mm (3.94 in) M63 cannon, a derivative of the D-10T gun found on the famous T-55. Its ballistic characteristics would have probably been much the same. For reference, the T-55’s Armor-Piercing rounds could penetrate 97 mm (3.82 in) at 3000 m (3300 yds), with its Armor-Piercing Ballistic-Cap penetrating 108 mm (4.25 in) at the same distance. These values relate to D-10T, as ballistic reports on the M63 are sparse to say the least. To reduce the effect of the heavy recoil on what was essentially a light tank, the gun was tipped with an elaborate Quad-Baffle muzzle brake. The gun was also equipped with a bore evacuator to assist in venting fumes from the cannon after firing.
Illustration made by the user Tin53 on the WoT EU forum
The gun could elevate to 36 degrees, in theory meaning it could take extremely effective hull down positions (as seen to the left). But the rear mounted turret meant the gun only depressed to -5 degrees.
An innovative feature of the gun was its chain drive loading system. The loader would drop the shell onto the tray, and the chain system would then ram the shell into the breach, saving him the arduous task of loading what is quite a large shell in a cramped fighting compartment. Of course, in the event of the chain-drive failing, the shells could be loaded manually. After loading, the chain drive would be folded out of the way to avoid being struck by the recoiling gun breech. The tank carried 18 ready rounds of 100 mm ammunition (AP: Armor-Piercing, APBC: Armor-Piercing Ballistic-Cap, APHE: Armor-Piercing High-Explosive) in the rear of the turret. There was more ammunition storage in the rear of the hull.
Under the almost bare forward hull, laid the tank’s power-plant, a 400 hp, V12 Engine. This allowed the tank to reach a top speed of 45-50 km/h. The tank’s torsion bar suspension system and track were designed specifically for it. Unusually for Soviet tanks of the time, the sprocket wheels were at the front of the vehicle. The tracks use external guide horns, rather than the more traditional center guides used on most Soviet tanks of the era.

Top-rear view of the Object 416. The size of the turret compared to the rest of the hull can be observed - Source:
Top-rear view of the Object 416. The size of the turret compared to the rest of the hull can be observed – Source:
The Object 416 during Testing
The Object 416 at Patriot Park in April 2016 - Credits: Vitaly Kuzmin
The Object 416 at Patriot Park in April 2016 – Credits: Vitaly Kuzmin


As development continued, problems arose that would affect its intended role as a light tank. Problems with steering, and firing on the move hindered the development. As such, the vehicle became more of a Tank Destroyer, and as such was re-designated as the SU-100M. One source suggests that this was the only way the project would continue to be funded.
The vehicle itself never saw service or production, losing out in tests to the SU-100P. Ironically this vehicle also ended up as a canceled project. The two vehicles sat for a long while side by side at the Kubinka Tank Museum. The Object 416 is now at the Patriot Park in Kubinka.

An article by Mark Nash

Object 416 specifications

Dimensions 6.35 oa x 3.24 x 1.83 m (20’9” x 10’8” x 6′)
Total weight, battle ready 24 tons
Crew 4 (driver, gunner, loader, commander)
Propulsion 12 cylinder Boxer diesel, 400 hp
Suspension Unsupported torsion bar
Speed (road) 45 km/h (28 mph)
Armament 100 mm (3.94 in) L/58 M-63
7.62 mm (0.3 in) coaxial machine-gun
Armor Hull: 60/45/45 mm (2.36/1.77/1.77 in)
Turret: front 110 mm, +110 mm mantlet (4.33, +4.33 in)
Total production 1 prototype

Links & Resources

Object 416 on FTR
The Object 416 on Dogs of War (Russian)
The Object 416 described by Mihalchuk-1974 (Russian)

Tank Encyclopedia’s own illustration of the Obj. 416 by David Bocquelet.