Feeding issue when bolt is locked to the rear

[A5BLASTER]

The Mags are ACS and AR Stoner.

All of the other parts are PSA.

I hear good stuff about PSA parts and weapons just don't have any first hand experience with it.

Arstoner is asc mags. I would order up a CPD mag and see what it does if it still messes up maybe look at the gun for something out of spec are not installed correctly.