Has anyone experienced this before? You’re casually firing semi-auto, a case is extracted and the bolt flies home, stripping the next round from the magazine and then “click”
I’ve been here before, it happens, but this one was new to me. The round had chambered, mostly, but the bolt head had stopped just short of being fully seated, right in the middle of the feed ramps. It was stuck. Bad. Obviously the gun didn’t go off because the firing pin didn’t properly strike the primer. I tried to rerack it, either to properly seat the round, or just 86 it and use the next one. The bolt wouldn’t budge. It was in there pretty good. Tried the charging handle, even the forward assist… lol. Ended up having to mortar it.
Then I kept shooting. Got through the rest of the mag just fine. Next I tried a different mag, with a different grain weight. Same thing happened once more. Had to mortar it again.
Hmmm… The first 60ish rounds through this new build didn’t have an issue. The next 30 had these two bolt jams totally kill the cycle. Not sure what to make of it. Couldn’t be cleaning related, the things brand new, right? Sure it doesn’t sparkle, but under a hundred rounds and two jams kill the gun with two different grain weights??
The build is a Palmetto standard “pistol” lower. Grid Defense 10.5, 300 BLK upper. Nothing remarkable about it, buffer weight standard, typical pistol length DI gassed, titanium nitrite BCG from Brownells.
I’ve been trying to check if anything was out of spec, as the action isn’t exactly as smooth as, say, a Daniel Defense. It didn’t appear to have issues when I manually racked snap caps through it. Only 2 out of about 90 rounds had the issue. Was using 300 BLK mags as is only proper.
Any thoughts? How does a bolt get stuck in the feed ramps like that?