This mil-spec carbine castle nut secures the receiver extension to the lower receiver on AR-15 and AR-pattern rifles and pistols. Precision machined with the standard notched castle nut design and finished in black, it's built to work alongside a mil-spec carbine buffer tube and receiver end plate for new builds, repairs, or replacement.
Machined to mil-spec dimensions, this castle nut threads onto the rear of the lower receiver to secure the carbine buffer tube in place, working in conjunction with the receiver end plate. Its precision-machined surfaces and standard notched design support proper fit and a secure connection at the receiver extension.
This castle nut is compatible with mil-spec carbine buffer tubes and receiver end plates across AR-15 and AR-pattern rifle and pistol builds, making it a fit for new builds as well as repair or replacement applications.
Follow all manufacturer instructions and safe handling practices.
Ensure compliance with all applicable federal, state, and local laws.
Product Type: AR-15 Carbine Castle Nut
Platform Compatibility: AR-15 / AR-Pattern Rifles and Pistols
Specification: Mil-Spec
Function: Secures the Carbine Receiver Extension / Buffer Tube to the Lower Receiver
Receiver Extension Compatibility: Mil-Spec Carbine Buffer Tubes
Construction: Precision Machined
Machining: Precision Machined Surfaces for Proper Fit and Secure Installation
Design: Standard Notched Castle Nut
Finish: Black
Color: Black
Approximate Weight: 0.02 lb.
Installation Location: Rear of Lower Receiver at the Receiver Extension
Compatible Components: Carbine Buffer Tube and Receiver End Plate
Intended Use: AR-15 Carbine Buffer System Builds, Repairs, and Replacement Applications
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