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The M4's 14.5-in. barrel length reduces muzzle velocity to about 2900 ft/s. [151] This reduced wounding ability is one reason that, despite the Army's transition to short-barrel M4s, the Marine Corps has decided to continue using the M16A4 with its 20-inch barrel as the 5.56×45mm M855 is largely dependent upon high velocity in order to wound ...
Firearm muzzle velocities range from approximately 120 m/s (390 ft/s) to 370 m/s (1,200 ft/s) in black powder muskets, [3] to more than 1,200 m/s (3,900 ft/s) [4] in modern rifles with high-velocity cartridges such as the .220 Swift and .204 Ruger, all the way to 1,700 m/s (5,600 ft/s) [5] for tank guns firing kinetic energy penetrator ammunition.
The M4's 14.5" barrel length reduces muzzle velocity to about 2900 ft/s. [193] This reduced wounding ability is one reason that, despite the Army's transition to short-barrel M4s, the Marine Corps has decided to continue using the M16A4 with its 20″ barrel as the 5.56×45mm M855 is largely dependent upon high velocity to wound effectively.
The following year, the ArmaLite AR-15 was adopted by the United States Army as the M16 rifle, and it would later become the standard U.S. military rifle. The specification included a Remington-designed bullet and the use of IMR4475 powder, which resulted in a muzzle velocity of 3,250 ft/s and a chamber pressure of 52,000 psi. [8]
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 ...
The M4 Commando with its short 11.5-inch (290 mm) barrel suffers the same failings as its predecessors: a substantially lower muzzle velocity and greater muzzle flash, in comparison to longer M16 rifles and carbines. The lower muzzle velocity can reduce carbines' wounding effects. [15]
The Colt ArmaLite AR-15 was discontinued with the adoption of the M16 rifle. Most AR-15 rifles in U.S. service have long ago been upgraded to M16 configuration. The Colt ArmaLite AR-15 was also used by the United States Secret Service and other U.S. federal, state and local law enforcement agencies.
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 ]