Hi Mr.X, & thank's for the info. It's too late, I've already started. The thing was, I just could'nt get on with the gun as a Pnumatic, I accept that many I000`s of people can, & good luck to them!, I actually damaged my shoulder loading this thing, to the point of not being able to load it without the use of my "Easy Loader", the design of which I posted a few month's ago, this work'd great, but the gun was too slow for me, so I've decided to go back too a "Band Gun", but now, I'm left with a painfull shoulder, something that I hope wont stop me from loading a Band Gun, as the force to load it is divided between "Both" arm's. I wanted to "Convert" this gun, so as to keep the Grip,(which I re-work'd to a better angle) & the Trigger Mechanism, which, if i'm right, will easily take one 20mm band, & maybe, two, if need be. I've stripped this gun down, & the design of the "Catch" that hold's the piston under great pressure, seem's to be good & strong. I made the mistake of adding another "Band" to a previouse Band gun, & the trigger mech fail'd, as it was'nt designed to take that much "Force", but this one will, & still be smooth. Now, I now what you'r all thinking,"The Inner & Outer tube's wont be able to take the stress of the Band's, it'll "Flex & Bend" ", well, I've given this a lot of thought, as I'm going to make matter's worse by, "Milling" a 2.5mm wide slot, along nearly the whole lengh of the gun, through the top of both tube's, including the "Nozzle". I'll keep you all posted,...Geoff.