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The Range
NFA & Class III Discussion
Short Stroke
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<blockquote data-quote="CAR-AR-M16" data-source="post: 843138" data-attributes="member: 204"><p>I assume you are talking about a full-auto AR that fires fine in semi, but ocassionaly will not fire a round in full-auto. The symptoms are that the round chambered and the hammer fell, but the round did not fire. If so, these are the classic symptoms of "bolt bounce". In full-auto the sear releases the hammer at almost the same instant that the bolt carrier is bouncing back after slamming a round into the chamber. The energy of the hammer is expended closing the bolt carrier and does not have enough force left to ignite the primer. This is usually seen when using a carbine buffer tube with too light a buffer. If you are using a standard buffer, try an H buffer, If you have an H buffer, try an H2 buffer. Some folks run a 9mm buffer, but I find the H2 works best for me.</p><p></p><p>If you are using a RDIAS, it could be a timing issue as well. Try this link for info on how to time an RDIAS: <a href="http://www.quarterbore.com/nfa/dias.html" target="_blank">http://www.quarterbore.com/nfa/dias.html</a></p><p></p><p>YMMV. Hope that helps.</p></blockquote><p></p>
[QUOTE="CAR-AR-M16, post: 843138, member: 204"] I assume you are talking about a full-auto AR that fires fine in semi, but ocassionaly will not fire a round in full-auto. The symptoms are that the round chambered and the hammer fell, but the round did not fire. If so, these are the classic symptoms of "bolt bounce". In full-auto the sear releases the hammer at almost the same instant that the bolt carrier is bouncing back after slamming a round into the chamber. The energy of the hammer is expended closing the bolt carrier and does not have enough force left to ignite the primer. This is usually seen when using a carbine buffer tube with too light a buffer. If you are using a standard buffer, try an H buffer, If you have an H buffer, try an H2 buffer. Some folks run a 9mm buffer, but I find the H2 works best for me. If you are using a RDIAS, it could be a timing issue as well. Try this link for info on how to time an RDIAS: [URL="http://www.quarterbore.com/nfa/dias.html"]http://www.quarterbore.com/nfa/dias.html[/URL] YMMV. Hope that helps. [/QUOTE]
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