Thread: thread size of standard AR-15 barrel
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Old December 26, 2009, 04:16 AM   #2
DnPRK
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Join Date: August 24, 2001
Location: LC, Ca
Posts: 1,917
Yes, they are 1/2"x28

ETA: this applies to .223 and 5.56
Last edited by DnPRK; December 26, 2009 at 07:04 PM.
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