Does it lock the bolt back when the mag is empty?
If so, then its getting enough gas, if not then it needs more.
Is the buffer spring got a bit of grease or oil on it, not to much but not as dry as a nun's nasty...
And what type of mag, a lot of the 5 round mag's are problematic in the way their springs are coiled and apply to much pressure on the cartridges, and that then causes similar issues you are facing...
A 10 round mag, with something limiting follower travel to 7 rnds is best for A-cat...
Just food for thought.
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