Agreed. CONSISTENCY is what I worry about. If I get cases ejecting in a neat pile, I don't give a damn where that pile is, it's when they eject all over the map that I begin hunting problems and fixing them.
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I would consider this rifle over gassed and in need of increased dwell time. Just a matter of time before a dirty chamber causes a ripped off rim and a stuck case. A Sprinco enhanced action spring, or similar, and an H2 buffer are in order IMHO.
I believe this answer hits the nail on the head. Not that I rank up there with IG, but I did experience this in one of my builds and I went crazy and drove my friends crazy on how to get it to eject "better". My AR's run a variety of buffet weights - all Vltor A5's. I have one AR, for whatever reason needs an A5H3 buffer and heavier spring (a Sprinco from Tactical Springs in Austin to cycle properly. Put a standard A5 Spring in the buffer tube - no joy, fails to cycle properly. Tried it all. My point is that I did all that buffer/spring swapping to find the right combo so my weapon would cycle properly. (After I ensured there wasn't a problem with how I built it.) Once I did that (thanks to DocSherm) my weapon cycled perfectly as advertised. Whether it ejects casings at 1300, 1400 is not a factor or reason to start tweaking or trying to fix something that isn't broken. IMO.
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I think too many people obsess over which direction the rifle ejects spent brass.
You shoot some low powered stuff like Tula, or some real hot re-loads, the direction will change . . .
Ejection angle is only of concern if it is associated with another malfunction.
IMHO people tinkering with reliably functioning rifles because of "ejection pattern" is an exercise in stupidity, and could very well lead to unintended problems that turn your reliable rifle into a headache. You want to change the pattern? Put a heavier buffer in it and call it a day.
One of my "budget builds", a PSA premium midlength runs like a top. It piles XM193 + XM855 clones in a little pile at about 1-3:00, Tula and PMC bronze at about 3-4:00, and some of my low powered handloads at 4:00 or so with a standard spring and carbine buffer. Bolt locks back on empty with every load...................good enough for me.