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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.
The table below gives a list of firearms that can fire the 5.56×45mm NATO cartridge, first developed and used in the late 1970s for the M16 rifle, which to date, is the most widely produced weapon in this caliber. [1] Not all countries that use weapons chambered in this caliber are in NATO. This table is sortable for every column.
5.56×45mm NATO: Action: Short-stroke piston, closed rotating bolt: Rate of fire: 750 rounds/min: Muzzle velocity: 920 m/s (3,018 ft/s) Effective firing range: 600 metres (660 yd) Maximum firing range: 2,860 metres (3,130 yd) Feed system: 30-round proprietary detachable box magazine 100-round C-Mag drum magazine STANAG magazines (with optional ...
5.56×45mm NATO: Caliber: 5.56 mm (.223 in) Rate of fire: 950 round/min: Effective firing range: 500 meters, depends on barrel length: Maximum firing range: 850 meters, depends on barrel length: Feed system: STANAG magazine: Sights: Iron sights or various optics
The SR-556 is a semi-automatic AR-15 style rifle manufactured by Sturm, Ruger & Co. The rifle was introduced in 2009 in .223 Remington/5.56×45mm NATO and as a .308 Winchester AR-10 variant in 2013, the SR-762. [4] It is one of several AR-15 rifles to use a gas piston operation.
The Haenel MK 556 [2] (German: Maschinenkarabiner) [3] is a gas-operated selective-fire 5.56×45mm NATO assault rifle designed by German company C.G. Haenel.The MK556 was finalised in September 2020, and it is a fully automatic version of an earlier Haenel design, the CR 223, which was already in limited use by law enforcement agencies since 2017. [4]
The AR-15 rifle usually comes chambered for either the military cartridge 5.56×45mm or the .223 Remington. Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as .223 Remington, since this can result in damage to the rifle or injury to the shooter. [1]
The former was slightly longer than the previous model at an overall length 556 mm (21.9 in) with a 289 mm (11.4 in) barrel and used the rear grip from the LSW as a foregrip, while the latter used a 17.4-inch barrel (442 mm) with an overall 709 mm (27.9 in) length and was fitted with the handguard from the LSW.