Fte, ftf bca 20" grendel.

[montana]

No, it holds open on the bolt body half the time. Which i thought was weird because i don't get feeding jams. One fte. Only one time did it cycle... the others were empty chambers... rack and fine. It's very odd. It shouldn't be happening which is why I brought up me not shouldering it. The only thing I can wrap my head around.

So it is short stroking. Do you have another bolt carrier that is known to work you can try?