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AR15.COM
4/8/2010 8:02:12 PM EDT
got a barrel and FH and the threaded ends are the same size diameter but different thread size.... can someone shed some light on this?

ETA the barrel is a 9mm barrel and the FH is a standard 5.5inch FH

ETA nevermind I found out 1/2x36 VS 1/2x28