Aero Precision Complete Upper Receiver M4E1-T SM12.7 5.56x45mm NATO 13.9in Government Mid Length 1 in 7 1/2 x 28 12.7in A2 Flash Hider Anodized Black. 9in 5.56x45mm NATO EM12.7 Complete Upper Receiver then you have come to the absolute right place.
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