
It's a very good idea and I did the same for my nerf guns. It fits on any gun, but works the best with air-pump guns because it automatically snaps down after each shot. Here's what the attachment looks like:



Here is the most important part, the video:
Beretta attachment
It works extremely well and I'll be making many more. Keep in mind that this is just a prototype. Ideally, it would be much closer to the valve and longer for stronger guns. I will also be making a groove where the joints come together for a better seal. The PVC isn't cut in the exact center. It's cut above so it snaps into place. I have had no joint problems yet and it doesn't warp how straight the barrel is. Any quesitons?








