Originally Posted by
lysander
During acceptance testing of new M4 carbines, they are allowed to fail ejector springs after 3,000 rounds on half the weapons under test, and still get a "PASS".
During acceptance testing of new M4 Carbines, they are allowed to fail ALL of their extractor springs after 3,600 rounds, and still get a "PASS".
Gas rings must last at least 1,200 rounds, for a "PASS".
During extended endurance testing, 36,000 rounds per gun with ten guns, the Army averaged barrel life at 5,800 rounds.
Having looked at many pictures of M4s and M16 parts tested to 6,000 rounds, I can say that nothing on the PSA upper in Garand Thumb's video looks abnormal.
Reports from Henderson Defense indicate PSA bolts give good service and last a long time.
I have finished repairs my Nomex coat, so I will go out on a limb here and state that from all the information I have gathered, I feel an standard sample size of PSA Carbines would successfully pass MIL-DTL-71186B acceptance.