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SMc cartridges were developed in an attempt to produce an efficient cartridge combining low recoil, low heat, and high velocity. [4] The 5 mm/35 SMc has produced velocities in excess of 4,800 ft/s (1,500 m/s) shooting a 30-grain (1.9 g) molybdenum disulfide-coated Berger bullet from a 28-inch (71 cm) Pac-Nor barrel, far higher than its commercial counterpart the .204 Ruger.
When first introduced in 1956, the AR-10 used an innovative combination of a straight-line barrel/stock design with phenolic composite, a new patent-filed gas-operated bolt and carrier system and forged alloy parts resulting in a small arm significantly easier to control in automatic fire and over 1 lb (0.45 kg) lighter than other infantry ...
A patented AR-15-pattern is produced with a bolt design featuring a redesigned extractor intended to improve the extraction of cartridges under adverse conditions. The company also produces a redesigned bolt carrier intended to improve the reliable performance of the rifle's “internal piston” system by obtaining a similar timing sequence with 14.5-inch carbine-length barrels compared to 20 ...
The fire control system and bolt carrier group are derived from the American M16 rifle. [14] The gas operating system is derived from the AKM. The K2 uses the same magazine as the M16. The barrel rifling has 6 grooves, 185 mm (1-in-7.3) right hand twist. The K2 has 3 selective firing modes: semi-auto, 3-round burst, and full automatic.
The rifle is fed from detachable box magazines, holding 5 rounds each. The stock is made from fiberglass, and is designed to be used from a bipod only. The buttstock is adjustable for length of pull with rubber spacers, and can be removed for compact storage. The rifle has no open sights; it can be used with a variety of telescopic or night sights.
The rifle strips down into the following components for regular maintenance and cleaning: the receiver, stock, pistol grip and trigger group, handguard, bolt, bolt carrier and recoil mechanism. Handguards in the first several series were "square" in section (see LC picture), covering from magazine well to front sight.
The rifle was shortened and lightened to improve mobility for mechanized and airborne troops, and a knife bayonet was added. The MAS-49 built-in rifle grenade launcher was replaced by a combination compensator/rifle grenade launcher that fired NATO-standard 22mm rifle grenades. The rifle also incorporates an integral grenade launching sight ...
The rifle has a radial block receiver similar to the Spencer, but the rounds were fed from an Archimedean-screw magazine which formed the spine of the rifle stock and could hold up to 28 rounds. The fluted cartridge carrier made a quarter turn each time the lever was operated, feeding a new cartridge into the breech.