All but one M4 (W2) and B2 (a semi-auto only) had cracked bolt lugs by 6000 rounds. (the ones with dashes in the table don't count, they didn't finish the test)
Which, by the way, is cause for failing an acceptance test . . . In fact:
ALL the weapons tested would have failed had this been an acceptance test.
W1 - excessive extreme spread, cracked bolt, excessive malfunctions.
W2 - excessive extreme spread, (It just barely passed for malfunctions, one more and it would have failed)
Obviously, none of the piston modified would have passed the number of allowed malfunctions, cracked bolt or cyclic rate.



Reply With Quote
Kind of a dumbed-down Cliff-notes version?

Bookmarks