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The Enhanced Performance Round was made to nearly match the trajectory of the M855 to aid in training consistency—the SS109/M855 ballistic coefficient (G7 BC) of 0.151 was improved to 0.152 for the M855A1 [143] —but the ranges to get desired effects are greatly extended.
Initial comments by Springfield Armory test staff were favorable, and some testers commented that the AR-10 was the best lightweight automatic rifle ever tested by the Armory. [43] In the end, the U.S. Army chose the T44, now named the M14 rifle , [ 37 ] which was an improved M1 Garand with a 20-round magazine and automatic fire capability.
Switching to the 5.56 mm green bullet, the M855A1 Enhanced Performance Round, or EPR, in 2010 has eliminated nearly 2,000 tons of lead from the waste stream. [15] U.S. Army representatives at a 2013 House Armed Services Committee hearing have credited the 5.56mm M855A1 Enhanced Performance Round "close to" those of a 7.62 mm in its performance ...
There is now relative parity between the wounding capacity of the M67 and the current M855 5.56×45mm round. However, there have been repeated and consistent reports of the M855's inability to wound effectively (i.e. fragment) when fired from the short-barreled M4 carbine (even at close ranges). [ 44 ]
In 1965, Winchester Western published a set of ballistics tables for G1, G5, G6 and GL. In 1971 Sierra Bullet Company retested all their bullets and concluded that the G5 model was not the best model for their boat tail bullets and started using the G1 model. This was fortunate, as the entire commercial sporting and firearms industries had ...
In 2013, the current M4A1 version can fire 1,691 mean rounds between stoppages using M855A1 ammunition. [91] During the 2009 Marine Corps Infantry Automatic Rifle testing, the Colt IAR displayed a MRBS of CLASS I/II Stoppages of 952 rounds, with a MRBEFF (Mean Rounds Between Essential Function Failure) of Class III Stoppages of 60,000 rounds.
The differences are caused by the size and reflectivity of the flakes in the paint, and also by their orientation and the degree to which they are all oriented in the same direction. Historically, it was difficult to achieve an invisible repair if the paint was damaged because it is critical to reproduce the flop of the original surface as well ...
Like the M855A1, the M80A1 has better hard-target penetration, more consistent performance against soft targets, and significantly increased distances of these effects over the M80. The bullet is redesigned with a copper jacket and exposed hardened steel penetrator, eliminating 114.5 grains (7.4 g) of lead with production of each M80A1 ...