The Sons of Liberty Gun Works castle nut secures the receiver extension (buffer tube) on an AR-15. It is made from 17-4 stainless steel and nitride treated, with six deep staking notches and an extended length for a secure, properly staked installation.
- Brand: Sons of Liberty Gun Works
- Part number: SOLGW-CASTLENUT
- Fits: AR-15 receiver extension
- Material: 17-4 stainless steel
- Finish: nitride, matte black
- Features: 6 deep staking notches, extended length
