The Luth-AR A2 Buttstock Kit (Luth-AR part no. BS-A2K) is a complete, drop-in package for shooters upgrading or repairing an AR-15’s rear end. Rather than sourcing individual parts, this kit bundles the fixed A2-style stock with a mil-spec buffer tube, buffer, spacer, and spring, so everything needed for a full rear-end rebuild arrives in one box. The fixed A2 profile is a proven, no-frills design that has been standard on AR-platform rifles for decades, prized for its simplicity and durability over adjustable alternatives. Finished in black to match most AR builds, this kit is a straightforward way to get a complete, mil-spec-compatible stock setup from Luth-AR without hunting down separate components.

Key Specifications

• Features a fixed A2-style stock, the classic, non-adjustable AR-15 profile.
• Built to mil-spec buffer tube dimensions, not commercial spec.
• Kit includes a buffer tube, ready to install.
• Kit includes a buffer, matched to the stock and tube.
• Kit includes a buffer spring for reliable bolt carrier cycling.
• Kit includes a stock spacer for a proper fit against the receiver.
• Finished in black to match most AR-15 builds.
• Fits standard AR-15/M16/M4 platform receivers.
• Bundles every component needed for a complete rear-end build in one kit, with no separate parts to source.

Frequently Asked Questions

Is this a fixed or adjustable stock? Fixed, the classic A2 profile.

Does it use mil-spec or commercial-spec parts? Mil-spec buffer tube and components.

What is included in the kit? The A2 stock, buffer tube, buffer, spring, and spacer, everything needed for a complete install.

Buy the Luth-AR A2 Buttstock Kit

Get a complete, mil-spec rear-end setup in one box. Order the Luth-AR A2 Buttstock Kit from our AR15 stocks selection at our Lubbock, Texas gun shop, with fast shipping to your door.