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Andres, The Gen3 Sound Mitigation Buffer SMB is a single-stage captured drop-in replacement for your standard buffer and spring. The SMB is designed to keep the buffer spring from rubbing against the inner wall of the buffer tube providing smooth, quiet operation. Has adjustable spring weight (*Main spring can be trimmed at .25 lbs per coil to reduce tension up to a max of 12 coils) Stay safe & have a great day!

Hi Andres and welcome. It is a replacement for an AR Buffer tube and spring. It is effectively both a shock absorber and noise reducer that lessens recoil, smooths the recoil impulse and quiets the operation of the AR. Cheers and stay safe. It replaces this operation (starting at 45): https://www.youtube.com/watch?v=omv85cLfmxU