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The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge. [216]
The Zion-15 is IWI's first M4-styled modern sporting rifle.It uses a direct impingement gas system, has a 16-inch barrel with a 1:8 inch twist, has a 15-inch free-floated handguard with M-LOK attachment points, and an adjustable stock, while the upper receiver has a Picatinny top rail.
The first attempt to find a replacement for the M4 came in 1986, ... is a lightweight 5.56×45mm NATO (and .223 Remington) caliber, ... but with a 16-inch (41 cm) barrel.
The Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.
It appears that this round can drastically improve the performance of any AR-15 weapon chambered to .223/5.56 mm. Superior accuracy, wounding capacity, stopping power and range have made this the preferred round of many special forces operators, and highly desirable as a replacement for the older, Belgian-designed 5.56×45mm SS109/M855 NATO round.
An 18-inch (457 mm) (MOD 0/1) or 16-inch (406 mm) (MOD H) threaded-muzzle match-grade free floating stainless steel heavy barrel with a 1:7 (178 mm) rifling twist ratio is standard for the SPR. [11] [3] [13] The barrels are manufactured by Douglas Barrels with a unique contour that reduced weight but maintained rigidity for accuracy. [14]
The AOR is available in two variants; the M21-5 which uses the 5.56×45mm NATO round, and the M21-7 which uses the 7.62×51mm NATO. [4] [5] There are four sub-variants for the M21-5: M21-5 CQB Carbine with 10.5 inch long barrel; M21-5 Carbine with 14.5 inch barrel; M21-5 Standard with 16-inch barrel; M21-5 DMR Sniper rifle with 18-inch barrel
The 5.56 PDW variant with an 11.5" barrel will replace the current Swedish inventory of Ak 5D carbines and other PDWs, while the infantry 7.62 rifle (16" or 18") will replace existing Automatkarbin 5C rifles and Automatkarbin 4B/C rifles. The 7.62 marksman variant (18" or 20") will replace the Ak 4D DMR.