QC5 9MM AR PCC SIDE-CHARGING/REAR-CHARGING
9mm Para. cal., 5 1/2, 7 1/2, or 10 1/2 in. barrel, MP5 mag., Mil-Spec parts, SB Tactical A3 or PDW brace, milled billet aluminum rear or side-charging upper and lower receiver, Picatinny rail, M-LOK (side-charging) or KeyMod (rear-charging...