Armaspec Self-Retention Castle Nut Aluminum Black ARM6521-BLK

The Armaspec Self-Retention Castle Nut is designed for AR-15/M4 style rifles and features a self-retaining design that eliminates the need for staking. Constructed from durable aluminum with a black finish, this castle nut provides secure attachment of the buffer tube while allowing for easy installation and removal. The innovative design maintains proper torque specification while preventing loosening during use.