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MCX Rattler Upper Features Sig Sauer, SIG MCX Rattler Upper, 300 Blackout, 5.5″ Barrel, M-Lok Handguard, Black Finish MCX Rattler Upper Specifications UPC Code: 798681587735 Manufacturer: Sig Sauer Manufacturer Part #: UAMCX-5B-300-BLK-TAP Model: Upper Type: Upper Caliber: 300 Blackout Barrel Length: 5.5″ Finish/Color: Black Description: MCX Upper Fit: SIG MCX Subcategory: Upper Receivers
