The Armaspec SRS Buffer Kit (brand part no. ARM263-H2) is a complete Gen 4 buffer tube assembly that bundles every part needed to mount a stock onto an AR-15 lower receiver in one package. It includes a mil-spec 7075-T6, six-position buffer tube along with a steel castle nut and end plate, so builders are not sourcing those pieces separately. At the heart of the kit is Armaspec’s SRS Gen3 enhanced multi-stage recoil buffer, engineered to smooth out the recoil impulse compared to a standard mil-spec buffer, and this kit ships with the buffer in the H2 weight for shooters who want additional mass for a heavier-recoiling caliber or a suppressed setup.

Key Specifications

• Includes a mil-spec 7075-T6 six-position buffer tube.
• Includes a steel castle nut and end plate.
• Built around Armaspec’s SRS Gen3 enhanced multi-stage recoil buffer.
• Buffer weight: H2, suited to heavier-recoiling calibers or suppressed setups.
• Sold as a complete kit, not individual components.

Frequently Asked Questions

Does this kit include the castle nut and end plate? Yes, both are included along with the buffer tube and buffer.

What buffer weight does this kit ship with? The H2 weight, part of Armaspec’s Gen 4 SRS lineup.

Buy the Armaspec SRS Buffer Kit

Finish your lower with a complete, matched buffer system in one order. Order this Armaspec kit from our AR buffer system selection, and our Lubbock, Texas team will get it shipped fast.