- suitable for GHK M4 GBB Rifle- Includes: aluminum outer barrel, steel flash hider adapter and M4 steel barrel nut- Aluminum outer barrel: full CNC machining, coated with hard anodizing in MIL-STD- All steel parts: full CNC machining, manganese phosphate surface treatment- Steel flash hider adapter-M14-LH - Steel M4 barrel nut M32xP1.5- One-piece design outer barrel and barrel nut- Superb verisimilitude experienceManufacturer : Zparts
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