Even replaces leather units.

Fits HW 25,30,35,50,55,80,85.90,95,99- Beeman R1, R6,7,8,9,10,11.

Can replace those in the HW77,97 range for better lock up. Also Marksman 28, 50-55 series, 60 and 61 etc.

Does not fit the .25 barrel for R1-80. Fits the other calibers however.

 Since factory breech slots vary by 6 thou or so. You can sand the bottom of the seal for a better fit. However all seals set and shrink by heat and use. Most new gun seals are softened or shrunk by oil or bluing salts.

Newest batch is slightly harder for problem underlevers