Weird WTF jamb?

[BD1]

I may have finally gotten to the point of reliability. The rifle functioned perfectly through a 30 round match last Saturday for the first time. I had pulled it all apart, polished all of the leading edges of the extension lugs and feed ramps, and that helped, but it still would jam at a match. So I ordered a variety of buffer weights and recoil springs and wound up with a 3.8 oz buffer using a used standard weight recoil spring, and I seem to finally have hit the sweet spot for this 22" rifle +2 barrel. I will keep the forum posted.

I should have noted that I won this match. I shoot much better when I am not having to clear jambs or fuss about single loading