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Posted: 4/29/2012 7:37:24 AM EDT
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My AR15 A2 20" barrel was removed, 0.750 FSB removed, turned down to 0.625 with 0.625 FSB installed. Prior to changes no problem. After new FSB, I notice some short stroking. About 2 out of 20. Since things were fine before with a polymer clip, I assume that the bolt (key, bolts, rings) are all OK. The short stroke was observed while using a 2009 metal clip picked up at a trade show. There were also two failures to feed which I attributed to the clip. One of my diagnoses of the short stroke will be to take two properly functioning polymer clips to the range as well. The only other thing I can think of is to check the alignment of the FSB hole. Anything else to check?
Thanks |
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You have it right.
Use only known-good magazines. #1 suspect is the new FSB and related elements. Sounds like it's not flowing gas as freely as it was. . Is the FSB located properly ? Has the barrel's gas port been constricted from the machining ? Is the gas passageway in the new FSB constricted ? Is the gas tube interfacing with the FSB correctly ? Is the gas tube clear ? . |
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