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Posted: 2/1/2007 10:37:50 AM EDT
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What determines the direction where a case is ejected? I have custom upper that ejects casings @ a low arc almost straight ahead. My bushy upper throws them in a high arc, backwards @ maybe +20deg from straight back. Is that clear? It's almost confusing to me! Just wondering what causes the different directions (same ammo). -robert |
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There may be a few variables, but mainly the extractor tension. I don’t mess with my extractor, but some folks like to trim their extractor spring coils in an attempt to adjust the clock angle that the rifle ejects the cases. I’ll leave the hows and whys to those who have done it. This may help: TECHNICAL NOTE 34, ADJUSTING THE EJECTION PATTERN OF THE AR-10® RIFLE |
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Potty training one's rifle (modifying the ejector spring) is one most used by those which shoot in High Power matches, where having your ejected brass tossed over into the fella's lane shooting next to you - is considered rude and in bad form. You'll quickly find yourself relegated to the extreme right lane, where your errant flying brass won't be a distraction to other shooters. Potty training also makes it quite easy to police up your brass after your done w/ your stage, for if the modification is done properly, all your ejected rounds will be laying in one small pile. While not considered a modification normally made to SHTF or everyday shooters/plinkers it is a safe and reliable mod whereby one removes the ejector spring and carefully clips it back "one" round at a time (replacing it and testing it after each round and yes it's not un-common to clip 2 rounds off the first time and one thereafter) until the desired ejection consistency is obtained. One should NOT attempt this modification without having a replacement ejector spring handy and IMO you should always save the original and modify the replacement ejector spring just to be on the safe side. mike |
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