JP Enterprises LMOS Low Mass Operating System buffer Red. These AR15 Recoil Buffers from JP Enterprises are part of their Low Mass Operating System (LMOS) for faster smoother cycling. Competition shooters get the speed they need with the JP Enterprises LMOS Buffer Unit and other system components. Optimize performance on your AR-15 with the JP Enterprises LMOS Buffer JPLMB. Specifications for JP Enterprises LMOS Buffer Component: Finish: Red Anodized Weight: 3 oz. Features of JP Enterprises LMOS (Low Mass Operating System) Buffer: Requires full-length extension tube Not for use with AR-10-type rifles Package Contents: JP Enterprises Low Mass Operating System (LMOS) Buffer JP Enterprises JPLMB: LMOS (Low Mass Operating System) buffer Red