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2. Heckler & Koch G41 - Wikipedia

   en.wikipedia.org/wiki/Heckler_&_Koch_G41

   The Heckler & Koch G41 is a German 5.56×45mm NATO assault rifle introduced in 1981 and produced in limited quantities by Heckler & Koch.It was designed to replace the 7.62×51mm NATO chambered Heckler & Koch G3 and the G3 based .223 Remington/5.56×45mm and later 5.56×45mm NATO chambered Heckler & Koch HK33 service rifles providing a more modern weapon compatible with then recently ...

3. Heckler & Koch HK33 - Wikipedia

   en.wikipedia.org/wiki/Heckler_&_Koch_HK33

   Due to the short barrel, the HK33KA3 cannot be used to launch rifle grenades or mount a bayonet. HK53 Compact version of the HK33K. Has a short 211 mm (8.3 in) barrel, a forearm derived from the MP5 submachine gun and a telescopic shoulder stock or receiver endplate cover (later models also received a four-prong flash hider). HK13 Light machine ...

4. Heckler & Koch G3 - Wikipedia

   en.wikipedia.org/wiki/Heckler_&_Koch_G3

   The weapon can also mount a 40 mm HK79 under-barrel grenade launcher, blank firing adapter, a straight blowback bolt (called a "PT" bolt, lacks rollers) used for firing 7.62×51mm ammunition with plastic bullets, a conversion kit used for training with .22 Long Rifle ammunition and a sound suppressor (that uses standard ammunition).

5. Heckler & Koch HK21 - Wikipedia

   en.wikipedia.org/wiki/Heckler_&_Koch_HK21

   Thus a chambering dependent (4:1 for 7.62×51mm NATO) or (3:1 for 5.56×45mm NATO) transmission ratio is maintained (as long as the rollers move on the inclined surfaces of the barrel extension and locking piece) of the bolt carrier and locking piece relative to the bolt head; the bolt head carrier travels backwards significantly faster than ...

6. Caliber (artillery) - Wikipedia

   en.wikipedia.org/wiki/Caliber_(artillery)

   The effective length of the barrel (from breech to muzzle) is divided by the barrel diameter to give a dimensionless quantity. [2]: 81 For example, the main guns of the Iowa-class battleships can be referred to as 16"/50 caliber. They are 16 inches in diameter and the barrel is 800 inches long (16 × 50 = 800).

7. True Velocity RM338 - Wikipedia

   en.wikipedia.org/wiki/True_Velocity_RM338

   The LWMMG is operated by a gas-operated, long-stroke piston with a rotating bolt located under the barrel and fires from an open bolt. It uses “Short Recoil Impulse Averaging” technology, patented by General Dynamics and previously used on their XM806 machine gun, where the entire barrel, barrel extension, gas system, and bolt assembly ...