Armaspec 9 Sound Mitigation Gen3 Buffer SS/Black. The SMB is designed to keep the buffer spring from rubbing against the inner wall of the buffer tube providing smooth quiet operation. Pat#US8800424/Pat. Pending Specifications for Armaspec C Sound Mitigation Gen3 Buffer: Manufacturer: Armaspec Color: Stainless/Black Country of Origin: USA Features of Armaspec C Sound Mitigation Gen3 Buffer Single-stage drop-in replacement for your standard buffer and spring Reduce felt recoil Keep the buffer spring from rubbing against the inner wall of the buffer tube providing smooth and quiet operation Adjustable spring weight (Main spring can be trimmed at .25 lbs per coil to reduce tension up to a max of 12 coils) made in specialized factories Lifetime Warranty Package Contents: Armaspec C Sound Mitigation Gen3 Buffer Armaspec ARM258-9: 9 Sound Mitigation Gen3 Buffer SS/Black