The TacFire A2 Mil-Spec Buffer Tube Kit (brand part number MAR110) replaces a damaged stock system or lets you transition an AR-15 from an adjustable 6-position stock back to a fixed A2-style stock. TacFire builds the buffer tube from black aluminum to Mil-Spec dimensions, so it accepts a standard A2 stock (sold separately) without modification, and pairs it with a 12.75-inch buffer spring sized specifically for the fixed A2 length. It’s built for 5.56x45mm NATO and .223 Remington AR-15 rifles only, making it a straightforward fix for a rifle-length build that needs its stock system restored.

Key Specifications

• Mil-Spec A2 Buffer Tube accepts a standard A2 fixed stock without modification.
• 12.75-Inch Buffer Spring is sized specifically for the fixed A2 buffer tube length.
• Black Aluminum Construction keeps the tube lightweight and corrosion-resistant.
• 5.56x45mm NATO/.223 Remington Fitment is built specifically for these AR-15 chamberings.
• A2 Stock Not Included — this kit is the buffer tube and spring assembly only.

Frequently Asked Questions

Does this include the A2 stock itself? No, the A2 stock is not included; this kit is the buffer tube and spring assembly.

How long is the buffer spring? 12.75 inches, sized for the fixed A2 buffer tube length.

Will this work on any AR-15 caliber? It’s built specifically for 5.56x45mm NATO/.223 Remington AR-15 rifles.

Buy the TacFire A2 Mil-Spec Buffer Tube Kit, AR-15, Black Aluminum

Restore your rifle’s fixed-stock system with a TacFire A2 Buffer Tube Kit from our rifle parts selection. Order online and we’ll ship it straight to your door from our Lubbock, Texas gun shop.