Sooo, I got a new lower a while back. It is a CC AR-9 (glock mag) lower. when I first got it, i put it together, tried a couple of mags (empty), and then had it engraved (and sent off the F1 paperwork). well today i was messing around with some other mags to see what hi cap mags would drop free from it. i found out that loaded 40 sw mags either stick really bad on seating them or won't even seat all the way.
most empty mags are fine. glock factory and ETS drop free if empty. SMG will do not and KCI (surprise) won't even seat. 9mm mags seem to do better though
i am thinking i am going to need to slightly widen the magwel to fix this. how easy/hard and how much do you think it would cost to fix this? who other than the original OEM can fix it?
ETA:
Link to lower in question. CC and joe bob's AR9 lowers are all made by new frontier