The Sons of Liberty Gun Works castle nut (MPN SOLGW-CASTLENUT) is a mil-spec AR-15 buffer tube retaining nut.

Key Specifications

• Sons of Liberty Gun Works castle nut
• Fits mil-spec AR-15 buffer tube threads
• Standard AR-15/M16 replacement part
• Compatible with most mil-spec firearms

Frequently Asked Questions

What does a castle nut do?
It retains the buffer tube/receiver extension against the lower receiver.

Does this fit mil-spec builds?
Yes, it’s designed to fit most mil-spec firearms.

Buy the Sons of Liberty Gun Works Castle Nut

Keep your buffer tube locked down with this castle nut from Sons of Liberty Gun Works. Ships fast from a Lubbock, TX gun shop in our AR buffer systems lineup.