02-23-2012, 05:25 PM
I have an Alexander 24" Overwatch upper and it is treaded similar to your pic and is threaded 3/4-28.
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Barrel threads
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Barrel threads - by ibgp3 - 02-23-2012, 02:06 PM
Barrel threads - by Drifter - 02-23-2012, 03:18 PM
Barrel threads - by wheelguner - 02-23-2012, 05:25 PM
Barrel threads - by ibgp3 - 02-23-2012, 08:14 PM
Barrel threads - by leopard6.5 - 02-23-2012, 08:35 PM
Barrel threads - by ibgp3 - 02-23-2012, 10:18 PM
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