I've read this thread a couple times and am still confused. Right now you've got what looks like a "counter weight" on the end of the barrel. For it to function as a muzzle break you'd want to drill holes or create slots perpendicular to, and PERFECTLY on center with the bore of the barrel or you'll ruin the accuracy of the gun by creating an uneven pressure area for the pellet to travel through (the pellet will be drawn off its path by way of venturi). I'd be willing to bet by drilling these holes you'd also be making the gun noticeably louder when shot to... As is the case with most centerfire weapons with muzzle brakes. A counterweight keeps the muzzle from climbing / reduces felt recoil by adding weight to the muzzle, and they look cool.A muzzle brake reduces felt recoil and sometimes reduce muzzle climb by venting pressurized gas from the barrel to counteract "lift" created because the bore is off center with the stock / grip of the gun.Now if you wanna make a home brew "suppressor" / "silencer" / "quieter dongle" / "whatever you wanna call it"... I'd be inclined to never say anything of it here no matter how practical it is to have and fun it is to use... This being a "Public" forum and all. BUT, I don't think it would be illegal. Because I believe air guns aren't classified as weapons in most states, or by federal law.[/color] Sooooooo..... UP TO YOU!
(in my best southern drawl) Why Quacker, whatevah do you mean?