Factory T/C Encore barrels are available in rimfire cartridges. The barrel/bore is offset, so the Encore's centerfire firing pin hits the rim of the rimfire case. It does have a mono block design hump, but I feel its better then a pin selector.
http://www.tcarms.com/firearms/encoreRimfire.phpI choose the Encore over the Contender because I wanted higher pressure cartridges and didn't want to open and close the action, just to re cock the hammer as with the older Contender frames, the new G2 fixed this problem. The Encore came out before the G2, so I chose the Encore over the older Contender.
I also didn't want the firing pin selector, I have heard of people firing with the wrong selector during a hunt, just to hear the load noise the hammer falling and the game runs off. I wish they would have when with offset rimfire cartridge barrels on the G2, but then all the older rimfire Contender barrels wouldn't have worked on the G2.
yooper77