I have a RPB 37mm launcher for sale that is in like new condition. This launcher comes with mount to attach it to a 20" HBAR barrel. I put this on a Bushmaster 20" HBar and never used it, the gun was a safe queen. The gun was not fired with it attached, nor was the launcher itself fired. The launcher does not have any scratches, only minor handling marks. I did test fire it with a shell loaded only with a primer and it worked fine (uses shotshell primers). Also comes with M203 hand guard, 10 nylon reloadable shells, spacers and caps to load the shells, and two adapters (one for 26mm and the other 12 gauge). This item is no longer listed on their website and I believe it's out of production. It is made of steel, except for the grip area being plastic. The launcher came with aluminum spacers to mount on a smaller diameter barrel, but I think you will need the M203 bracket to use them correctly. Price is $150.00 USD which includes USPS priority shipping to the continental USA. I can be paid with paypal if you like. If you have any questions or would like pictures please contact me with email or IM button.