My buddy & I built a PSA AR-15. Not the first one I've messed w/by any means but the first LPK I'd installed. Problem is we can't load full mags. We loaded 3 30rd & 2 40rd Magpul mags w/30 & 40 rounds, respectively. The mag release wouldn't engage to hold the mags in w/the BCG closed. Removing 1 round from the 30rd mags or removing 2 rounds from the 40rd mags or having the BCG locked open they locked in no problem. What could be the issue here?
R.I.P. CPO Matt Mills-(DEVGRU)- You will NEVER be forgotten!
10-25-75 / 8-6-11 *K.I.A.*