I'm sure this has been covered before, but I'm trying to help a guy out with his M1icon. First of all, its a CAI receiver.

The rest of the parts are a mix of GI and what I assume are Beretta (PB).

I cleaned everything, gauged the gas cylinder and op rod piston. Everything seems OK.

Fired two clips. First clip ejected after the 7th round. Second clip tried to eject after the 6th, but only made it half way, which threw the 7th.

I know these receivers are known to be junk. Giving the receiver the benefit, what else should I check?
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