From what I remember when I was testing it out over the weekend, it feels like the hop up wasn't pushing the retaining clip in all the way as you said. What would happen is:
Insert Mag
-the action of me sticking the mag in pops on BB into the chamber
-first BB fires, but the retaining clip isn't pushed in, so the following BB's can't make their way up
I've read about the lip not fitting/shaving it issue, but I think that would just not let the mag fit properly at all I guess. The ACR was made to take normal metal mags along with PMags so it shouldn't be an issue.
I guess I'll try to mess around with the mag catch or the other bit - or just order more PMags. =/
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