GC_UPC Daniel Defense DDM4 MK12 SPR 5.56mm 18" URG, Black $1,633.00 23-142-10035 show more like this Free Shipping over $500 RifleGear GC_UPC Daniel Defense AR-15 MK12 SPR Upper Receiver Assembly 5.56x45mm 18 Barrel - 298797" $1,633.00 23-142-10035 show more like this 15.00 MidwayUSA