these take a 2 piece bolt , you will need that and the tiny 4-48 middle set screw.. the long rear screw will be provided. THESE ARE NOT PRINTED AT HOME , they are made by HP multi jet fusion. Its a 1/2 million dollar machine , so these are outsourced. They should last for many years of abuse. The main advantage is the pictitanny rail , im not aware of other crosman breeches with it. I also think it looks cool , so thats a bonus .,YES THIS WILL WORK ON PCPS.