So I just picked up several plastic 100 round mid caps for my M4. They all feed wonderfully, however 3/5 mags fit way too tightly in the mag well of my Echo 1 M4A1 (Stag 15). Tight to the point of almost not even being able to get them back out of the mag well. I just spent about an hour on one magazine, first filing with a small file, then outright shaving off thickness with a pair of scissors. I've tried virtually every angle and spot on the mag I can think of to file, but it's still just as tight in the mag well.... Anyone got any advice?
Thanks!