LBE Unlimited ARCNUT AR-15 Castle Nut 4140 Steel Manganese Phosphate

The LBE Unlimited ARCNUT is a castle nut designed for AR-15 buffer tube assemblies. It secures the buffer tube to the receiver extension and is sold as a replacement or upgrade part for builders and owners working on an AR-15 platform.

The nut is machined from 4140 steel and finished in manganese phosphate, which gives it a black color. The steel and finish are the principal specifications listed for this part.

Its listed fitment is AR-15 buffer tube assemblies. Confirm compatibility with your specific receiver extension and buffer tube before installation.

• Brand: LBE Unlimited
• Model: ARCNUT Castle Nut
• Platform: AR-15
• Fits: AR-15 buffer tube assemblies
• Material: 4140 Steel
• Finish: Manganese Phosphate
• Color: Black