jag
Give Mike a call at OTT(603-750-3232) and can fix you up with a rimfire barrel that doesn't use the adapter block, just knock out the hinge pin and install the rimfire barrel like any centerfire barrel. I have the very first one he made marked "Prototype No Adapter" 22 L.R. Match. It is 18 inches long and full bull and will do less than 1/2 inch with most ammo including the cheap stuff, ironically the worst groups were with match stuff. Sure is a breeze to change barrels without having to keep up with a separate breech block. Mike will listen to your wants when it comes to barrels. He is making my next barrel now, it's a 357 Max. for my Encore pistol. Part of the fun is looking and dreaming up what you want.
Steve E...........