The TacFire AR-15 Mil-Spec Buffer Tube Kit with QD Attachments (brand part no. MAR050) gives builders everything needed to finish out the back end of an AR-15 lower in one box. The kit centers on a 6-position collapsible stock with a built-in QD swivel socket and rubber butt pad, paired with a mil-spec 6-position buffer tube sized to standard mil-spec receiver extensions. A carbine-length buffer spring, 3 oz. carbine buffer, standard end plate, and castle nut round out the kit, so there’s no hunting for compatible small parts. It’s a straightforward way to build or upgrade a mil-spec AR-15 stock setup with quick-detach sling capability built in.

Key Specifications

• Includes a 6-position collapsible stock with a built-in QD swivel socket and rubber butt pad.
• Built around a mil-spec 6-position buffer tube for standard receiver extension compatibility.
• Ships with a carbine-length buffer spring matched to the buffer tube.
• Includes a 3 oz. carbine buffer for proper cycling.
• Comes with a standard end plate for mounting the buffer tube to the lower receiver.
• Includes a castle nut to secure the buffer tube in place.
• Adds quick-detach sling capability through the stock’s integrated QD socket.

Frequently Asked Questions

Is this a complete buffer tube assembly? Yes, it includes the buffer tube, buffer, spring, end plate, castle nut, and stock.

Does the stock have a QD sling socket? Yes, it includes a built-in QD swivel attachment point.

Is it mil-spec sized? Yes, the buffer tube is mil-spec 6-position sized.

Buy the TacFire AR-15 Mil-Spec Buffer Tube Kit

Finish your AR-15 build with a complete, mil-spec buffer tube and stock kit in one order. Get the TacFire Buffer Tube Kit from our Lubbock, Texas gun shop for fast, reliable shipping — or browse more AR-15 stocks and forends.