The KynSHOT RB5100 Adjustable Damped Shotgun Recoil Buffer features three adjustable damped settings allowing the shooter to tune the buffer to the type of ammunition they are shooting. Positioned on the threaded portion of the cylinder, the buffers three damping profiles provide low, medium and heavy damping with distinct markings indicating which damping profile your buffer is adjusted to. The RB5100 is designed to fit any stock adapter or receiver that uses Mil-Spec style threads and can be used with any Mil-Spec style collapsible stock.