- for KSC M4 GBB- Include: KSC Mk16 Barrel Nut(KSC-M4-008)- Aluminum alloy CNC machining- Coated with hard anodizing in MIL-STD- Exactly copy genuine parts- All the chamfering signatures and sizes, all the tool marks,and bore hole signatures are fully restoredManufacturer : ZParts
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