Building a project gun and want the barrel and action. My preference is for falling block but break open is fine as well. Cheaper is better as I will only need the barrel and action. The stock will be thrown out or given away. I don't want any vintage rifles or anything with collector value as I will be destroying all of that value. Something like an H&R/NEF Handi rifle would work. Also an Encore would fit the bill. I'm also open to other calibers (44 mag, 444 marlin, whatever) in a single shot, falling block or lever if 45-70s are not available so long as the ammo is readily available.