1 Attachment(s)
failure to feed diagnosis
Good range day with my friend. We went to his range, which is only 25 yards. I took the mags I had been using, as well as the new Korean made ones, and let him have fun with a box of 50 rounds.
Sure enough, on the 4th round the failure showed itself with the USGI magazines, then almost always every other round (seems to only effect the left side rounds.
The malfunction only happened once on the Korean mags, and only on the third to last round of the magazine (last round feeds from the left of the follower).
I took pictures, and they all looked the same...
Attachment 121461
The bolt pics up the round, pushes it forward part way, then before the base of the round pops up from under the magazine's lip, the bolt slips off the top and wedges on top of the round. I think bolt slippage occurs just a hair before the round is fully out of the magazine. When I pull the bolt back to clear, the round pops up.
I think I can try...
1) tearing down the mags, cleaning inside again, and spraying some dry teflon lube inside and on the follower.
2) polishing the edges of the feed lips, especially the front part.
3) opening the front corners of the feed lips slightly if (1) and (2) fail
4) the slight amount of vertical play in the magazines seems to be isolated to the trigger gaurd pin. I can try shimming it with a small piece of aluminum tape on the underside of the pin.
My friend shoots righty. As I watched him, every round ejected the same at 4:30 - 5 o'clock, and I easily caught the brass in my hat. I shot one mag as a lefty, and every shot either went just past my right ear, or hit my forehead. One problem at a time:)