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The Sig Caliber X-Change kits lists: barrel threaded M9 x .75, adapter .5 x 28. My question is .5 x 28 = 1/2 x 28 correct? Yes...but 1/2 x 28 left hand or 1/2 x 28 right hand thread? May be obvious to some of you, but I'm new at this and don't know the answer.