This is probably the wrong section but I'll continue I would like to modify my brothers bb gun and pellet rifle.I just want to up the velocity, is the easy or even possible? This has nothing to do with real guns so it should be fine but can people send me links to do this. My bro has a Daisy powerline 693 c02 bb hand gun 400fps and a delta Gamo Cadet 177 pellet rifle 495fps. Thanks for your time