ATI Outdoors Advanced Technology AR-15 Castle Nut – Mil-Spec Threading

The ATI Outdoors Advanced Technology AR-15 Castle Nut secures the buffer tube to the lower receiver and locks the end plate in place. This replacement part is essential for AR-15 builds, repairs, or upgrades when swapping stocks or buffer systems. It ensures proper tension on the receiver extension and prevents loosening during recoil.

Machined from steel with mil-spec threading, this castle nut features standard staking notches for permanent installation with an end plate. Installation requires a castle nut wrench and armorer's block. Staking the nut after torque is recommended to prevent rotation under heavy use.

• Part Type: Castle Nut
• Compatible Firearms: AR-15 Pattern Rifles
• Material: Steel
• Threading: Mil-Spec
• Installation: Drop-In (Requires Castle Nut Wrench)
• Features: Staking Notches for End Plate