20rnd P-Mag FTF?
I've got a M&P 15 and when using a 20rnd P-Mag and cycling it by hand (letting the bolt slam home) the 18th round consistently fails to feed and the bolt slams on the side of the cartridge. It almost seems as though the primer end of the round does not move into position with the feed lips on that 18th round.
I've used this mag at the range and it didn't have any problems, possibly due to recoil jostling the rounds into position, but when cycling by hand the failure occurs.
Any one else experience this, and have any insight into this phenomenon.
(edit) After further investigation, it's the 19th round that fails to feed.
Last edited by An Undocumented Worker; 09-28-09 at 00:53