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The steel-tip penetrator of the M855A1 is noticeably separated from the jacket of the bullet and can spin, but this is part of the design and does not affect performance. The M855A1 costs only 5 cents more per round than the M855. [140] The M855A1 bullet has a 1 ⁄ 8 in (3.2 mm) greater length than the SS109/M855. [141]
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 ...
While M855 and M855A1 projectiles are being used for comparison and demonstration purposes, consideration is being given to using the creation of lightweight ammo cases as a chance to develop an intermediate caliber cartridge which might replace both the 5.56×45mm and the 7.62×51mm.
There were also complaints about the ammunition used in testing. The competition began while the M855 round was in use. In June 2010, the M855A1 Enhanced Performance Round was fielded, and the competition began using the EPR in August. Army analysis found that the M855A1 may have contributed to lower than expected reliability performance.
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 US Navy said the two pilots involved in the military plane crash near San Diego are in 'good condition' and under 24-hour medical observation.
A new adjustable rear sight was added, allowing the rear sight to be dialed in for specific range settings between 300 and 800 meters to take full advantage of the ballistic characteristics of the SS109/M855 rounds and to allow windage adjustments without the need of a tool or cartridge [196] The flash suppressor was again modified, this time ...
CNN: What’s the difference between flight anxiety and a flying phobia? Dr. Gail Saltz: Flight anxiety is just anxiety about flying. But diagnostically, there is a definition of aerophobia, and ...