This custom safety is machined from 6061-T6 aluminum. It's dimensions are slightly different to fit and function better than the original plastic safety for Crosman pistols. In some cases you may need to remove burrs or excess paint from inside the hole in the trigger frame, otherwise it may fit too tight to engage with the trigger. A 2" square piece of 300-600 grit wet/dry sandpaper can be rolled into a stiff tube to use as a reamer. That can be twisted to remove excess material inside the hole. This should be done with all parts removed from the frame which should be cleaned thoroughly before assembly.