So I've got around 2500rds through this LMT MRP. Currently suppressed. All have been flawless (besides a bad extractor that was replaced early on). Today, I went to the range and experienced what looked like a weird double feed with several different magazines pretty frequently, and once while driopping the bolt on a fresh mag. See pic. Both rounds are live and unfired.



The bottom round pops up and catches the bolt during it's forward travel, and keeps the top round from chambering. This was the same malfunction every time it happend. Always two live rounds. I thought magazines, but it happened with gen3 pmags, Okay Ind. USGI's, and a buddy's DD mag (5 different mags in total). All these mags worked fine previously in multiple rifles. When evaluated, sometimes the hammer was cocked, other times it was not.

Ambient temp was 18F. I used an H3 buffer with Geissele braided wire spring and a carbine buffer with a Tubbs Flatwire spring today. Both allowed the malfunction to happen. I used an H2 with the Geissele braided wire spring for most of the previus rounds before today. But the first 300rds today were fine with the h3 as well. I applied more lube. Still malfunctioned.

After the last rounds of the day were fired, I noticed the pistol grip was loose. I tightened it down and applied locktite. I don't know how this could have possibly caused double feed malfunctions. Becasue my ammo ran dry, I could not test.

Any thoughts?