VIPER M4 Complete Bolt

♦ FOR VIPER M4, SR15, SR16
♦ Include: steel bolt carrier, aluminum nozzle set, disassemble heavier mass, steel nozzle guide
♦ Steel bolt carrier full CNC machining, manganese phosphate surface treatment
♦ Aluminum nozzle set full CNC machining, coated with hard anodizing in MIL-STD
♦ Steel nozzle guide full CNC machining, manganese phosphate surface treatment
♦ Recommended to use gas magazine
♦ (M3 Screw)Recommended fastening torque 1.96 N.m
♦ Please use torque wrench and threadlocker
♦ Piston bore diameter: 19mm