The Armaspec SRS Buffer Tube Kit, H3 Gen 4 (brand part no. ARM263-H3), bundles everything needed to mount a stock assembly onto an AR-15 lower receiver in a single order. The kit contains a Mil-Spec 7075-T6 6-position buffer tube along with a steel castle nut and end plate, plus Armaspec’s SRS Gen 3 enhanced multi-stage recoil buffer to smooth out the cycling impulse. Rather than piecing together a buffer tube, castle nut, end plate, and buffer from separate listings, this kit gets a builder everything needed for a complete, correctly matched buffer system in one purchase.

Key Specifications

• Buffer tube machined from Mil-Spec 7075-T6 aluminum.
• Built to 6-position dimensions.
• Includes a steel castle nut and end plate.
• Includes the SRS Gen 3 enhanced multi-stage recoil buffer.
• H3 buffer weight configuration.

Frequently Asked Questions

Does this kit include the stock itself? No, this kit covers the buffer tube, castle nut, end plate, and recoil buffer; the stock is sold separately.

What buffer system does this kit use? It uses Armaspec’s SRS Gen 3 enhanced multi-stage recoil buffer for smoother cycling.

Is this buffer tube Mil-Spec or commercial diameter? It’s a Mil-Spec 7075-T6 6-position buffer tube.

Buy the Armaspec SRS Buffer Tube Kit

Order it from our Lubbock, Texas gun shop for fast, direct shipping to your door, and complete your buffer system in one simple order.

Shop more from Armaspec and browse our full AR buffer system selection.