The Army tested all of the 5.56mm weapons with M855A1 ammunition in 2016, for the M4-types the reliability were:
M4A1 (new) - MRBS: 3592; MRBEFF: 6076
M4A1 (rebuilt) - MRBS: 3671; MRBEFF: 5758
In order to make a good comparison, on would need to know how many weapons were used, how many rounds per gun, cleaning schedule, rate of fire, magazine type.
The 2016 Army test used 6 new M4s, three Colt, three FN, six M4A1 PIPs, and six rebuilt M4A1, fired 6000 round through each gun as follows: four 30 round magazines between cooling, magazines one and three were semi-auto at 1 RPM, magazines 2 and 4 were full auto in 3 to 5 round bursts at 5 second intervals. After 600 rounds - wipe and lube, after 1200 rounds - disassembled, cleaned and measured. They used the Army's new blue follower "Enhanced" magazines.
What were the Navy's test criteria?
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