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Posted: 1/3/2010 5:20:38 PM EDT
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I'm curious about ejection in the AR-15 system - specifically, what can ejection tell you about the set-up of one's rifle? I see AR's that flip brass forward, some that flip them backwards; some that send them 5 feet, and some 20 feet. I know there are a lot of variables, and that a rifle-length action operates differently from an SBR. So, taking a 16" carbine, what is the optimum ejection pattern? And how does one fix a system that is ejecting brass poorly (whatever that means.) For the record, mine seems to kick the brass about 6 feet right and 3 feet forward. Operation seems good, and I've never had a failure in the several hundred rounds that have gone through it. On the fired brass I do notice a small toolmark on the headstamp that looks like a small dent that runs from the rim to the primer pocket. |
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Quoted: This seems to be coming up a lot lately. As long as the rifle is ejecting, I would't get to worried about it, but here ya go anyway: http://i38.photobucket.com/albums/e106/Captains1911/temp/ARejectionpattern.jpg Thanks for that chart. Sorry if my question is a recent dupe. It looks like an adjustable gas block might be in my future. Or maybe I should try a heavier buffer first? |
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Quoted:
Quoted:
This seems to be coming up a lot lately. As long as the rifle is ejecting, I would't get to worried about it, but here ya go anyway: http://i38.photobucket.com/albums/e106/Captains1911/temp/ARejectionpattern.jpg Thanks for that chart. Sorry if my question is a recent dupe. It looks like an adjustable gas block might be in my future. Or maybe I should try a heavier buffer first? Like i said, if it's ejecting I would leave it be. My Colt 6920 ejects at around 2:00, but it runs 100%, and that's what's important. |
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Quoted: Quoted: Quoted: This seems to be coming up a lot lately. As long as the rifle is ejecting, I would't get to worried about it, but here ya go anyway: http://i38.photobucket.com/albums/e106/Captains1911/temp/ARejectionpattern.jpg Thanks for that chart. Sorry if my question is a recent dupe. It looks like an adjustable gas block might be in my future. Or maybe I should try a heavier buffer first? Like i said, if it's ejecting I would leave it be. My Colt 6920 ejects at around 2:00, but it runs 100%, and that's what's important. OK, thanks. |
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Quoted:
Doesn't quality of ammo effect this as well? I know when I run M193 through my Spike's midlength, the brass ends up about 3-4 oclock. When I shoot Wolf, brass is all over the place. Quality? Maybe. Power? Definitely. When you shoot Wolf, you get a good demonstration of how inconsistently it's loaded because the cases go "all over the place." But if you use M193 consistently then change to a quality .223 loading, you'll notice that the empties eject differently-though they'll all go pretty much the same way. It has to do with gas pressure and impulse, which are affected by the overall pressure curve of the round. |
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What you are seeing for an ejection in a carbine length gas system is normal from my experience. The shorter the tube,the faster the impulse.
You can put a heavier buffer and/or carrrier,I tried that,it didn't seem to change much except a slight perceived recoil reduction. If it aint broke,don't fix it. |
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