Sep 13, 2017 · Since the first portion of the feed ramp is part of the aluminum upper receiver, the exposed steel nose has a solid chance of damaging that feed ramp. Or if the round presents too low, the bolt group coming forward can force that exposed steel point right into the rear face of the chamber and cause burrs right at the rear of the chamber, which ...
It's not clear whether the problems with M855 come purely from full auto fire or also occur with semiautomatic fire. In any case, the feed ramp erosion and broken bolt issues need to be watched. The problem appears to be specifically related to the M855A1 version, which has an exposed steel penetrator.
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May 04, 2011 · M855A1 greatly increases maximum range at which a Soldier armed with M4 or M16 can generate these consistent effects Army Research Lab live fire test results against soft targets showed that on average, the EPR surpassed the 7.62mm ball round. 7. M855A1 Provides Consistent Performance, Every Time! Yaw and pitch change with range,
The M855A1 has a copper-jacketed steel core, differing from the previous M855 round which has a lead core. The so-called "green ammo" not only has increased penetration of armor and hard targets, but allows the Army to be more environmentally friendly on its ranges and training environments.
rifle’s feedway, improving reliability and, importantly, preventing the hardened steel tips of new 5.56mm M855A1 Enhanced Performance Rounds from contacting Cox model engine (8,479 words) [view diff] exact match in snippet view article find links to article
The difference between standard feed ramps and M4 ramps is easy to see. The ramps on the regular rifle-type extension are cut just to the edge of the My experience with AR's is all A-1's. from my service in the '70's to my personal weapons, all of my AR's are early 1970 slab sided Colt SP1's.