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Posted: 1/14/2007 11:43:23 AM EDT
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i have a voltor mur upper with a 12" larue ff my barrel is not parallel with handrail. any tricks for checking square of treads on upper? thank you for any help |
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First off, Welcome to the site!!!!! 216.23.214.70/lt/handguards.html First off, pull the unit and double check your install. Make sure that you have not bent/cracked the upper receiver barrel socket by over tightening. Make sure that the barrel extension lip is flush with the socket lip, and mic down the sides/top or the receiver to confirm that the socket is still in line with the centerline of the receiver. Regarding your question of threads and sockets being milled out of spec, it does happen once in a while (was a bad run with one of the suppliers not to long ago), but mostly, the problems lies in the install of the parts done incorrectly (read something getting bent). |
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A mill table and dial indicator with a magnetic base is the simplest. Helps to have a few fixtures pre made to check the upper, The first is a straight rod lathed down just enough to fit inside the barrel socket and the other is a lathe threaded round that will thread on the barrel socket. |
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