Sig Sauer Cal-X Kit SIGMCX 300 BLK 6.75 Tapered Lug CALX-MCX-6B-300-TAP
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Aug 26, 2026
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Sig Sauer MCX conversion kit to .300 BLACKOUT with a 6.75" barrel and tapered lug. This caliber exchange kit works with both MCX rifles and MCX pistols. Sig Sauer Cal-X Kit SIGMCX 300 BLK 6.75 Tapered Lug CALX-MCX-6B-300-TAP
