FURTHER problems introduced with hotter ammo,

by passing by, Monday, May 27, 2019, 12:27 (1795 days ago) @ passing by

were in feed and extraction. Higher pressure/higher cyclic rates outstripped magazine ability to feed. Higher residue pressure at extraction had extraction failure, and higher cyclic rates also outstripped extractor ability to rebound and grab, or slam shut so hard that the extractor bounced off rim.

So, of course, after fixing those, they did it again with the carbines and new ammo, and had to "fix" it, again.

They bought an off the shelf and untried weapon, which simply needed a bit more test time to find and address any weaknesses, which were few. But, they fielded it, instead, under tremendous pressure to be up to date, and truly not giving a hoot about the gun and hoping it failed.

And, again, simply by shooting original ammo in original gun, and clean when needed, and all these "problems" go away.