UAMCX-9B-300B-SRD Showing the single result Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low Sale! IN STOCKSig MCX Upper, 300 Blackout, 9″ Barrel, Suppressed, Pinned & Welded, Black $2,379.99 Original price was: $2,379.99.$1,499.39Current price is: $1,499.39. Add to cart