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The Small Arms Thread, Part 8: 2018; ICSR to be replaced by US Army with interim 15mm Revolver Cannon.

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Let's all take a trip back to the late 1970s and early 1980s.  This was the time of punk.  This was the time of despair.   Punk was all about minimalism; strip everything down to a few chords, wear

Stechkin's Abakan (TKB-0146). https://www.kalashnikov.ru/abakan-stechkina-avtomat-stechkina-tkb-0146/        Bullpup, system of "recoil impulse shifted in time", 2-stage

So what, my 5.56 rounds are groundbreaking too if I shoot the dirt.

1 hour ago, Sturgeon said:


L2A2 is worse. 100 ft/s slower and with a deliberately thicker jacket so it never ever fragments.

And the Britbongs still bitch about its lethality.

Euroweaklings think it's humane to icepick an enemy so that they slowly die of blood loss.

Comrade Stalin approves!
So lethal against old Soviet helmets at 500m though!

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1 hour ago, Sturgeon said:


Different method of welding the receiver to the trunnion. Supposed to improve accuracy over the L85A2's LOL 4.12 MOA standard.

My guess is that that is partially why the A3 is so expensive (besides the fact that they're re-rebuilding it again).

AK-12 >> L85A2/L85A3
Were the "old" Daniel Defense handguards free-floating? It's interesting they didn't go back to DD for new handguards...

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4 hours ago, CDNcommissar said:

Does anyone have any information about the MG on top? Supposedly it was from Ruger (experimental). 



U.S. MACHINE GUN T23E1 .30 SN# 1



Manufactured by Springfield Armory, Springfield, Ma. - Gas-operated, air-cooled, belt-fed, automatic weapon capable of delivering both a high and low rate of automatic fire as well as semi-automatic fire. 4-groove rifling, right hand twist. Fed by ammunition box capable of holding 100 rounds. Weapon weighs approximately 26.65 lbs. Evolved from T10 series. Improved T23 with addition of a Browning Automatic Rifle (BAR) type rate reducer enabling weapon to fire at slow rate. Equipped with flash hider, bipod, carrying handle.

Notes: Except for the machine guns aficionados, this weapon is virtually unknown. It evolved from the T10 series of weapons. The T10s were made in collaboration with Colt, High-Standard and Auto-Ordnance and it is believed that Bill Ruger worked on this project for awhile. The project laid dormant until Clarence Simpson of the Springfield Armory was ordered to pick it up in 1943. His version included a BAR type rate reducer enabling the weapon to fire at a slower rate.
While the weapon tested well, the project was never seriously considered for adoption since they could not get the weight of the weapon under 26 lbs.




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Article about RT-20.




   The RT-20 system was created for a specific task - to penetrate the armor protection of an infrared sight mounted on a Serbian tank M-84. During the initial stage of the conflict in the Balkans, the use of tanks of this type with an infrared sight created considerable difficulties for the movement of Croatian units at night. The choice of a 20x110 mm “Hispano-Suiz” cartridge (the standard cartridge of the M55 Yugoslavian anti-aircraft cannons) was due to the fact that the power of its armor-piercing projectile was sufficient to break through the infrared sight armored cover.

   In the Croatian army, the RT-20 system was given the name "hand gun". Designer gun Ratko Jankovic. The effective firing range of the weapon is 1800 m. Weight is about 30 kg, overal leight - 1330 mm. Equipped with Kahles ZF 6x42 optical sight.

   The defeat of point targets at such ranges, for example a single soldier, under normal conditions is problematic and is associated with the ballistic characteristics of the used cartridge. However, hitting lightly armored vehicles (at reduced ranges) or aircraft and helicopters in the parking lot is possible.


   Secondly, besides the passive three-chamber muzzle brake and shock-absorbing backplates made of spongy rubber — quite usual attributes of any powerful weapon, for RT-20 it was necessary to develop a special reactive recoil compensation system, somewhat similar to that used in recoilless guns. Approximately in the middle of the barrel length, a series of holes are made in it, through which part of the powder gases from the barrel are led into the pipe passing over the barrel, and through it gases are led back through the nozzle, creating a reactive force opposing recoil forces when fired.
   This recoil compensation scheme has been used for the first time in the practice of mass-produced weapons. In our country, the reactive principle of recoil compensation has theoretically been studied for more than a decade, and even a whole herd of PhDs in this area wanders around somewhere, but the matter has not progressed beyond paperwork. Is war really the engine of progress?




СиÑÑема RT-20M1, ÑÑÑелÑба Ñ Ð¾Ð¿ÑиÑеÑким пÑиÑелом. ÐÑÑнал ÐалаÑников





   Whatever it was, but the application of the principle of reactive compensation of recoil put before the designer and a number of other technical problems, not all of which could be solved at least on a solid "three" [out of 5].

   First, they had to use the “bullpup” scheme, in which the trigger hook is connected to the trigger with a long spoke needle, which not only eliminated the possibility of adjusting the trigger length and force of pull, but also reduced to “completely no” the information "output" (trigger is very “dry”, without warning).





   Secondly, the upper location of the gas tube led to the shift of the telescopic sight bracket to the left and to the impossibility of firing from the left shoulder. By the way, the system has no open mechanical sight, but there are two brackets (different in design) - on the left for the day optics, on the right - for the night sights.

   In addition, the presence of a jet nozzle creates a number of problems, in particular the need for the absence of obstacles behind the weapon and the appearance of additional unmasking factors require the shooter and others to be extremely careful in order to avoid injuries from backward moving gases. Yes, and the shooter must lie at some angle to the weapon to his left, while the right shoulder should rest on the buttstock.

   Even at the first acquaintance with this weapon, the location of a rather long bolt handle on the left caused bewilderment (in the position for shooting, it rests on the right shoulder blade). Awareness of the purpose of the "additional safety" came during familiarization firing - when fired, it is better to take specific pose, without contact with the handle (which, at the same time, eliminates the danger from backflow gases).


СиÑÑема RT-20M1, заÑÑжание. ÐÑÑнал ÐалаÑников


   Speaking of any rapid fire can be done only through tears - to reload you have to get out of a rather heavy weapon, move it away from yourself, open bolt/chamber with an unusual movement, and if you have a hard extraction (which is not uncommon), try unlock it with a heavy object. Throw away the cartridge case, put the new catridge in and, sending it to the chamber, lock the bolt. It remains to crawl under the weapon and try again to find the target. Therefore, the provision of a relatively high rate of fire requires the presence of the second member - the loader. And in this case, the location of the bolt handle on the left makes it difficult to act - when the loader is positioned to the left of the shooter, it is necessary to act through shooter's back, if the loader is located to the right - through the gas port, blindly. And when tilting the weapon to the right at the bipod hinge, the gunner loses the target, since the sight is tilted along with the weapon.

   The barrel with the receiver and gas pipe connected to the lodge with two screws. The lodge is made of aluminum alloy by casting. There are no tools for individual adjustment. Casting and painting are extremely sloppy.





   In general, the system leaves the impression of “unfinishedness”, and taking into account the weight (30 kg), and extreme danger for the shooter, but not in terms of the impact of a very powerful impact, but on the practical possibility of changing the firing position after each shot - the return fire of the enemy is inevitable. When firing at night, a shot from the RT-20 is very easy to identify from two flashes at the muzzle brake and at the nozzle, in the afternoon - at blue-ish clouds of powder gases. Yes, and simply in service handling, carrying the RT-20 requires a lot of strength and endurance (especially when using a belt), for which the attachments are made on the left side of the weapon. But even the experience of the Second World War showed that the maneuverability of weapons is directly related to survivability and combat capability. So the 21-kilogram 14.5-mm PTRS was transported disassembled into two parts.


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