I have some M1 and some M2 Pmags that will not go into a new to me AR-15. It is a S&W M15 upper (need chrome lined barrels) and DPMS lower. The friend I traded items to had three PMAG Moes from 2015 and they fit. Then I tried sme PMAG M2 from 2018 and some fit well some were a pain to insert. Then I tried a PMAG FDE from 2007 and it fit and dropped from but a PMAG Black from 2008 was a pain in the rear to insert in the magwell.
Foilage M2 PMAGs, Sand, Black and FDE M3 PMAGs, Lancer, Troy, Hexmag series 1 (free), Brownells, DPMS, Center Industries, Colt, Labelle, D&H, Okay mags all insert fine and no issues with any of them.
So basically I guess the DPMS magwell might just be on the tight side of tolerances? Any remedy for this or just run it as is?
Also I know I should not have gotten this lower rifle combo but $425 was a good deal because it was a basically brand new M&P upper with a MPI bolt and the barrel was chrome lined and I could move this Rifle to my parents house for a plinker. I just tried PMAGs while I had it in hand and it came with the that inserted fine but did not drop free but I have that same issue of dropping free from my Factory Colt 6920 so I was not concerned.