- Made in Taiwan
- Must Use with :
- Zparts Steel Bolt Carrier for Viper M4 GBBR (VIPER-M4-001)
- Zparts Steel Bolt Carrier for Viper VI-46 GBBR (VIPER-VI46-002)
- Material : Aluminum Alloy (Full CNC Machined / Coated with MIL-STD Hard Anodizing)
- Piston Bore Diameter : 19mm