Running Suppressed Apr 13, 2016 Running a suppressed AR15 or SBR? This Gemtech 5.56 Suppressed Bolt Carrier is an absolute must have. Aero Precision SBR | Geissele MK8 MLOK Rail | CMT Upper | Gemtech 5.56 SBC | Trijicon MRO
MK8 
Rail | 