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Spook, that is just a 1/2x28 - 10x3/4 thread adapter. I was using my m11 9mm can on it while I waited for advanced armament to make me a custom 18t 1/2x28 -308 adapter for the 7.62SD can I have of theirs. I originally got the 7 inch barrel from M1S years back when they were threading them 1/2x28.
Last edited by mak91; 08-13-2010 at 07:23 AM.
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