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For VIPER M4 & SR15 & SR16
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Include Steel Bolt Carrier & Aluminum Nozzle Set & Disassemble Heavier Mass & Steel Nozzle Guide
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Steel Bolt Carrier Full CNC Machining + Manganese phosphate surface treatment
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Aluminum Nozzle Set Full CNC Machining, coated with Hard Anodizing in MIL standard
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Steel Nozzle Guide Full CNC Machining + Manganese phosphate surface treatment
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Recommended To Use Gas Magazine
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(M3 Screw)Recommended fastening torque 1.96 N.m
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Please use torque wrench and threadlocker