Description

## Anderson Manufacturing AR-15 Buffer Tube Castle Nut

Looking to finish off your AR-15 build with a quality, American-made part? Look no further than the Anderson Manufacturing [Tube](https://daytonatactical.com/collections/ar-stocks/buffer-tube-kits/) Carbine Castle Nut. This castle nut is machined from 4140 steel and coated with a manganese phosphate for durability. It’s a great replacement for an old or worn-out part and is perfect for new builds. So don’t settle for less—get your hands on an Anderson Manufacturing Castle Nut and rest assured you’re getting a top-quality product.

### Anderson Carbine Castle Nut Features:

– Steel castle nut
– Fits mil-spec and commercial buffer extension tubes
– Made In the USA
– SKU: D2-J109-0000

**WARNING:** This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: [**www.P65Warnings.ca.gov**](https://www.p65warnings.ca.gov/)

The buffer tube — also called the receiver extension — houses the buffer and buffer spring and provides the attachment point for the stock or pistol brace. Anderson Manufacturing buffer tubes are machined from mil-spec 7075-T6 aluminum and hard-coat anodized for corrosion resistance and long-term durability. Mil-spec diameter buffer tubes have a smaller outer diameter than commercial-spec tubes and are required for most quality mil-spec stocks, pistol braces, and stock kits currently on the market. Rifle-length buffer tubes are non-collapsible and used with fixed rifle-length stocks where a longer overall length is required or preferred. Carbine-length buffer tubes have six adjustment positions and accept collapsible stocks for adjustable length of pull on carbine and pistol configurations. Confirming the correct tube length and diameter for your specific build before ordering ensures compatibility with your stock, buffer, and spring combination. The Anderson Manufacturing buffer tube threads directly onto the lower receiver using the standard buffer tube thread specification and is secured with the receiver end plate and castle nut. For builders replacing a worn or damaged tube or starting a new lower build, it is a direct mil-spec replacement that accepts standard mil-spec buffers, springs, and stocks without modification.