07-15-2020, 07:07 PM
lazyengineer Wrote:Probably so. Barrel is well aligned with extension (sights all light up naturally, and lapping didn't do much as had a pretty uniform wear pattern when tried it). Brass is throwing to about 3:00, so doesn't appear to be over-gassed. That said, it is an adjustable carbine length gas system, so I might start playing with that all the same.
Also, I do have to give props to BRA. They responded in less than 1 business hour, sending out replacement extractors for free (i did not demand this btw); and with a note suggesting same - that I may be over-gassed.
I was hoping just removing the O-ring, which folks said would fix it, would fix it. And I was hoping lapping the upper, which folks would say fixes it, would fix it. Neither of those helped. So next step is to start adjusting the gas-setting. I hate doing that though, since the gun runs 100% reliable otherwise. But, here we are.
To follow-up on this part - my adjustible gas-block is frozen. So I took it to the range today and ran about 60 rounds of brass reloads through it to warm it up, which didn't work, and it's still frozen. But the brass ejection pattern is text-book perfect 4:00 - suggesting it's not overgased. I ran 40 rounds of Wolf Steel, again, with no problems about about the same ejection pattern.
So I'm not sure if it really is overgassed afterall, but it's not proving very easy to adjust if so! If I have to, I can probably pull the handguards off to get to it better, hit it with a torch, and try to open up the set screws some more - but I don't really want to, and am not seeing a brass ejection pattern to suggest that's needed. I have two Alexander Arm's extractors on the way; and will install one of those. If it still breaks with that one, then I'll know for sure it's just a bad run of BRA extractors.