The Shok-Buff prevents the slide from battering the frame during recoil by sandwiching a 1/10" thick poly fiber buffer between the slide and frame contact areas. Provides the optimum balance between shock absorption and longevity. Easily replaceable after absorbing up to 1,000 rounds of repeated firings, the Shok-Buff slides over the recoil spring guide between the guide and spring. Fits Government models only. Package of six buffers.