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Mfg Item #: UAMCX-5B-300-BLK-TAP
Sig Sauer MCX .300 Blackout Upper Receiver Conversion Kit
Convert any MIL-SPEC AR Lower into a MCX Rattler. Complete with upper assembly, lower receiver stock adapter kit, side folding AR buffer tube knuckler, and match duo trigger kit.
-Caliber: .300 Blackout (7.62x35)