Antreg® AR-15 Buffer Tube Castle Nut

The Antreg AR-15 Buffer Tube Castle Nut securely locks the receiver extension (buffer tube) and end plate to the lower receiver. Precision machined from aluminum and finished with durable hard anodizing, it is designed for reliable installation and long service life on AR-15 platform rifles.

Secure Buffer Tube Installation

The castle nut threads onto the receiver extension and clamps the end plate against the lower receiver, preventing the buffer tube from loosening or rotating during use. Standard castle nut wrench notches allow proper installation and torque when assembling or servicing the AR-15 receiver extension.

Machined Aluminum Construction

Manufactured from aluminum, the castle nut features a hard-anodized finish for increased resistance to wear and corrosion. Precision machining ensures proper fit with Mil-Spec AR-15 receiver extensions and end plates.

Made in the Czech Republic

The castle nut is manufactured entirely by Antreg at its production facility in Vyškov, Czech Republic, where each component is produced to the company's quality standards.

Benefits You Need to Know:

• compatible with AR-15 platform rifles
• secures the receiver extension and end plate
• standard castle nut wrench notches
• precision-machined aluminum construction
• durable hard-anodized finish
• made in the Czech Republic