Things I liked:It sealed up the gun fairly well; not perfectly, but enough to fire. I ran into a few problems, but they are most likely more attributed to my gun, and not the parts. This kit does work fairly well. Things I would have changed:The instructions are not for a layman. They could be improved much more. I am very good at reading schematics, but the schematics they provide are too blown up; they need to focus more specifically on the valve chamber, and how the parts fit together, instead of focusing on the entire breakdown of the gun; some of those parts are not important for your task. What others should know:You need to obtain the original schematic for your gun from the crosman website, and be familiar with the complete breakdown of your gun. If you are unfamiliar with the breakdown, and exact operation of your benjamin air gun, I promise you will have nothing but problems with this kit. This kit is only for those who know how the gun operates; that way you can figure out which seals go where.