The LBE Unlimited AR Milspec Buffer Tube Kit Black is a complete carbine stock assembly solution for AR-15 builders who want a true mil-spec receiver extension. This kit pairs LBE’s six-position mil-spec diameter buffer tube with a standard carbine recoil spring and buffer, giving your rifle smooth cycling and reliable performance in a straightforward, drop-in package.

Ideal for new AR-15 or M4 builds as well as refreshing a worn-out stock assembly, this kit provides all the core rear receiver components needed to finish the lower: buffer tube, carbine recoil spring, carbine recoil buffer, receiver end plate, and castle nut. It’s well suited for general range use, training, and everyday rifle setups where consistent function and simple adjustability matter. LBE Unlimited is known for producing dependable AR parts that meet military specifications and support long-term durability.

Key Features:

• Manufacturer: LBE Unlimited
• Model: Mil Spec Buffer Tube Kit
• Product Type: Buffer Assembly / Buffer Kit
• Platform: AR-15 Carbine
• Buffer Tube Type: Six Position Mil-Spec Diameter
• Includes: Buffer Tube, Carbine Recoil Spring, Standard Carbine Buffer, Receiver End Plate, Castle Nut
• Finish Color: Black