GIBBZ G4 SIDE CHARGING BILLET UPPER RECEIVER, NON-RECIPROCATION, COMPATIBLE WITH 556, 223, 9MM, 40CAL, 300 BLACKOUT, 6.5GRENDEL, 6.8SPC, AND MORE!
GIBBZ G4 SIDE CHARGING UPPER RECEIVER AR15
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GIBBZ G4 SIDE CHARGING BILLET UPPER RECEIVER, NON-RECIPROCATION, COMPATIBLE WITH 556, 223, 9MM, 40CAL, 300 BLACKOUT, 6.5GRENDEL, 6.8SPC, AND MORE!