This is the replacement valve cap that allow owners of Crosman 22xx guns that use 12g powerlets to eliminate having performance hampered by the OEM stem mounted piercing pin. The piercing pin can be cut off a stock valve stem or you can switch to Disco stem, or any one of more efficient valve stems available that do not use the stem mounted piercing pin. In addition, after removing the front grip frame screw, by using a simple flat spanner the Pro-Top can be unscrewed from the front of the tube so ALL of the valve parts, including the stem and seals can be removed and serviced. These will fit most of the 22xx base valve body's including the Disco, and B&A's Boss.
These fit most all of the 22xx platform rifles and pistols and are full length, aluminum with scope grooves, brushed finish. They weigh only 2.5 oz's as opposed to the same item in steel 7.2 oz's. The lefty's are especially nice for right hand pistol shooters. However, I have one Left, and one Right side bolt position. These have close tolerance reamed bolt bores to eliminate excess bolt "slop". Barrel bores are also reamed. Either breech comes with extended probe brass bolt and handle in either .177 or .22, bolt has hold open magnet, alum bolt bore plug, st/st Philips head breech screw in "NEW" rear location, 2 st/st barrel grub screws, and o ring.