I have a Thompson Machin Zephyr XL. It has an aluminum mono baffle stack,it's easy to take apart, easy to clean. I have several thousand rounds through it and it is holding up very well. It is fucking QUIET. I have 3 threaded barrel 22s. The savage MKII, all you hear is the click of the firing pin. The Ruger 22/45 TB, you hear the action blow back, but still very quiet. I also have the Remington 597. This action has a rubber bushing that the bolt rebounds off of. The gun sounds like you are cocking it every time you shoot it. Really fun to shoot. I can't recommend TM enough. I am super happy with the product, it was a great price. I paid $240, I think, a year ago, and I would do it again if I had to (minus the hassle of the ATF "loosing" my paper work in the mail). I'm pretty sure when I get a center fire can, it will also be from TM.