The Armaspec SMB Buffer Kit, H Weight, Gen 3 (brand part no. ARM268-H) is a complete drop-in buffer upgrade built around Armaspec’s Sound Mitigation Buffer (SMB) system. Armaspec designed the SMB to replace the OEM mil-spec buffer spring and weight as a matched pair, and the H-weight version adds mass over a standard carbine buffer to help tame harder-recoiling or over-gassed AR-15 builds. The added weight helps slow bolt-carrier velocity, which can reduce felt recoil and smooth out cycling on a carbine running a pistol-length or heavily ported gas system. This kit includes everything needed to complete the buffer system, so there is no need to hunt down a separately matched spring.

Key Specifications

• Built around Armaspec’s Sound Mitigation Buffer (SMB) design for quieter, smoother cycling than an OEM buffer.
• Uses H-weight mass, adding weight over a standard carbine buffer to help tame over-gassed or hard-recoiling builds.
• Sold as a complete buffer tube assembly kit, including the matched spring needed alongside the SMB weight.

Frequently Asked Questions

Why choose the H-weight buffer over a standard carbine buffer? The added mass helps slow bolt-carrier velocity, which can reduce felt recoil and smooth cycling on an over-gassed or short-gas-system AR-15.

Does this kit include the spring? Yes, it is a complete buffer tube assembly with the SMB weight and its matched spring.

Buy the Armaspec SMB Buffer Kit, H Weight

Tame a hard-cycling AR-15 with a heavier, quieter buffer built to match. Browse Schaefer Defense’s AR buffer system parts and order from our Lubbock, Texas gun shop — we’ll get it out to you as soon as it’s ready to ship.