The Armaspec SRS Buffer Kit, Blowback Weight, Gen 4 (brand part no. ARM263-BB) is a complete enhanced buffer tube kit sized for blowback-operated 9mm AR builds. Armaspec built the kit around a mil-spec 7075-T6 six-position buffer tube along with a steel castle nut and end plate, then paired it with a Stealth Recoil Spring (SRS) buffer weighted for a blowback platform rather than a gas-impingement 5.56 AR. A blowback 9mm carbine relies entirely on bolt mass and spring tension to control its cycling, so a correctly weighted buffer matters even more than it does on a gas gun. The SRS system also keeps the spring from rubbing the tube wall, cutting down on the rattle and buzz typical of a mismatched factory buffer.

Key Specifications

• Includes a mil-spec 7075-T6 six-position buffer tube for standard collapsible stock compatibility.
• Comes with a steel castle nut and end plate needed to properly mount the buffer tube to the receiver.
• Bundles a Blowback-weighted Stealth Recoil Spring (SRS) buffer, sized specifically for 9mm blowback AR platforms.
• Designed to keep the buffer spring from rubbing the tube wall for quieter, smoother cycling.

Frequently Asked Questions

Will this fit a standard 5.56 AR-15? No, the Blowback-weight SRS buffer in this kit is sized for 9mm blowback-operated AR builds, not gas-impingement 5.56 platforms.

What hardware is included? A mil-spec 7075-T6 six-position buffer tube, steel castle nut, end plate, and the SRS buffer and spring.

Buy the Armaspec SRS Buffer Kit, Blowback Weight

Give a 9mm AR build a complete, correctly weighted buffer system in one purchase. Browse Schaefer Defense’s AR buffer system parts and order from our Lubbock, Texas gun shop for fast shipping.