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The specification includes a Remington-designed bullet and the use of IMR4475 powder which resulted in a muzzle velocity of 3,250 ft/s (991 m/s) and a chamber pressure of 52,000 psi. [5] In 1970, NATO members signed an agreement to select a second, smaller caliber cartridge to replace the 7.62×51mm NATO cartridge. [12]
The barrel rifling was revised to a faster 1:7 (178 mm) twist rate to adequately stabilize the new 5.56×45mm NATO SS109/M855 ball and L110/M856 tracer ammunition. The heavier longer SS109/M855 bullet reduced muzzle velocity from 3,260 ft/s (994 m/s), to about 3,110 ft/s (948 m/s) [195]
With an adapter, it can use M16 NATO standard magazine. The 457 mm-long barrel, has six right-hand grooves and a 228 mm (1:9 in) twist rate. The barrel's external profile (from the breech to the front sight base) is identical to the Tantal's barrel, but the length from the foresight base has a visible tapered contour with a decreasing diameter ...
The M4 carbine (officially Carbine, Caliber 5.56 mm, M4) is a 5.56×45mm NATO assault rifle developed in the United States during the 1980s. It is a shortened version of the M16A2 assault rifle. The M4 is extensively used by the US military , with decisions to largely replace the M16 rifle in US Army (starting 2010) and US Marine Corps ...
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 ...
MV: Muzzle velocity, in feet-per-second; ME: Muzzle energy, in foot-pounds; P: Momentum, in pound (force) (lbf) times seconds. [1] A guide to the recoil from the cartridge, and an indicator of bullet penetration potential. The .30-06 Springfield (at 2.064 lbf-s) is considered the upper limit for tolerable recoil for inexperienced rifle shooters ...
5.56×45mm NATO: Action: Gas-operated, rotating bolt: Rate of fire: 600–750 round/min: Muzzle velocity: 991 m/s (3,251 ft/s; using the M193 round) 945 m/s (3,100 ft/s; using the M855 round) Effective firing range: 600 m: Feed system: Various STANAG Magazines. Sights: Adjustable front and rear iron sight optical sights
5.56×45mm NATO: Action: Gas-operated (rotating bolt) Rate of fire: 680 rounds/min: Muzzle velocity: 925 m/s (M21 A) 890 m/s (M21 S M193) 870 m/s (M21 S M855) Effective firing range: 450 m (490 yd) with iron sights 600 m (660 yd) with optics: Feed system: 30-round detachable box magazine: Sights: Adjustable iron sights, optional mount required ...