The Armaspec self-retention castle nut is made of anodized 7075 aluminum for AR-15/M4 receiver extensions. Per the maker, its self-retention threads need no staking.
- Manufacturer Part # : ARM6521-ODG
- Type : Castle Nut
- Fits : AR-15/M4
- Material : 7075 Aluminum
- Finish : Anodized
- Color : OD Green
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