Barrel Band

Matt Might try Americanairguns or hillair, jsairguns does custom machine work also How does that thing shoot ?

The whole project is from jsairguns, and it shoots great. i opted not to put a bottle on it because I wanted a compact package so from 3000-2000 psi I'm getting 900-880fps with NSA 142 grain hollow points for 3-4 good shots. I have a 1/2" port with the cothran valve and a 25 1/2" unchoked Lothar Walther barrel. I was thinking about sending an email over to them to see if they can do that. I HIGHLY recommend them if you want custom work done. Highly skilled people over there. I'm gonna do a whole post on it, but here is a pic of it if your interested.
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Over the years there has been many options offered. The three screw band by Marmot Militia? Neil Clague took a piece of one inch aluminum tubing and shimmed the original band. I used an over sized O ring. I think it was 15/16" x 3/32" and used 7/8" X 1/16" on either side. I've used the last two with pretty good success. There is a groove in the original factory band and you can take your barrel diameter then try an O ring to bring it up to 15/16" OD