you probably wont be able to find one that will fit, at least not the type you are describing, the clearance between the Magazine Tube and the Barrel is too tight.. What you MIGHT be able to find os one they made for Lever-action, and heavy-bbl Big Game rifles. Basically it was a 20[iece that mounted directly around the Magazine-tube/barrel in a "C" configuration, and was held together by a bolt or screw on the bottom. As someone already posted here Emailing Coyote Cap is your BEST bet, if anyone would know offhand which party youd need, or if it is possible at all, it'd be him.