Got it. That PDI unit isn't all it's cracked up to be, and yeah, I had the same issue, sort of. Had to wiggle the mag to get it seat right. I also found the dual arms to be a complete pain in the donkey.
Since then, I found a CNC brass hop up on eBay that's kind of halfway between the PDI and stock. Works WAY better. This whole bolt gun thing seems to a continuously evolving art form of tweaking and machining. hehehe. In fact, as the season winds down here it'll probably be time to tear the bolt gun down again in some other foolish quest for ridiculous range. It's only money, right?
Glad you found the cause of the glitch.
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