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Tennessee Gun Owners Forums
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Head Space?
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<blockquote data-quote="Mausermeister" data-source="post: 5453571" data-attributes="member: 7725"><p>First: Please post pics of brass. </p><p></p><p>Is the upper a Bear Creek Arsenal? They are notorious for being over gassed.</p><p></p><p>Without pics of brass, my guess is over gassed and maybe a burr in chamber. The dented shoulder is from case hitting the deflector as it is ejected and brass going forward is a classic sign of over gassed. A bright line on brass sounds like maybe a burr in chamber is scratching it. The bolt twists slightly as it locks and unlocks in the lugs of the barrel extension and usually the brass turns with it. Indent on base of brass sounds like ejector pin striking the cartridge base. The more over gassed and/or hotter the load, the more noticeable it will be.</p><p></p><p>Try polishing the chamber, especially the neck with a drill and a small bit of very fine 0000 steel wool wrapped on a chamber brush and oil to get rid of the burr. A heavier buffer and/or recoil spring or adjustable gas block will help with the gas issue.</p><p></p><p>[ATTACH=full]153146[/ATTACH]</p></blockquote><p></p>
[QUOTE="Mausermeister, post: 5453571, member: 7725"] First: Please post pics of brass. Is the upper a Bear Creek Arsenal? They are notorious for being over gassed. Without pics of brass, my guess is over gassed and maybe a burr in chamber. The dented shoulder is from case hitting the deflector as it is ejected and brass going forward is a classic sign of over gassed. A bright line on brass sounds like maybe a burr in chamber is scratching it. The bolt twists slightly as it locks and unlocks in the lugs of the barrel extension and usually the brass turns with it. Indent on base of brass sounds like ejector pin striking the cartridge base. The more over gassed and/or hotter the load, the more noticeable it will be. Try polishing the chamber, especially the neck with a drill and a small bit of very fine 0000 steel wool wrapped on a chamber brush and oil to get rid of the burr. A heavier buffer and/or recoil spring or adjustable gas block will help with the gas issue. [ATTACH type="full" alt="7ece239117706b9926754d531edabdba.jpg"]153146[/ATTACH] [/QUOTE]
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