TT .46
Magnum .46
K&B .48
Rossi .46
Fox .6
Tower .46
GMS .47

And of course the OS and more, all good engines, all with differant plus's and minus's. Do your research and chose the one thats right for you, don't trust the manufactures or mags. I would do a side by side comparison here on RCU. And do some searches on the engine forum.