CMMG AR15 Buffer Tube Castle Nut – AR-15 Platform

The CMMG AR15 Buffer Tube Castle Nut is a replacement or spare castle nut designed to secure the buffer tube to the lower receiver on AR-15 pattern rifles. This component threads onto the receiver extension and locks it in place, preventing rotation under recoil and ensuring the end plate stays properly positioned. Whether you're replacing a damaged nut, completing a build, or keeping a spare on hand, this castle nut provides reliable function at the rear of your receiver.

Machined from steel with a durable finish, this castle nut features standard AR-15 threading and staking slots for proper installation. Installation requires an armorer's wrench and should be staked in place to prevent loosening during use. A castle nut staking tool is recommended for best results.

• Part Type: Castle Nut
• Compatible Firearms: AR-15 Platform Rifles
• Material: Steel
• Finish: Phosphate or Black Oxide (manufacturer standard)
• Installation: Armorer's Wrench Required, Staking Recommended
• Includes: (1) Castle Nut