RE: What are some of the best running engines in the .40 to .50 rangr?
I agree with RedWing......the TT Pro .46 is my engine of choice.....they take a little longer to break in than an OS .46 FX, but they keep getting stronger and stronger. The OS FX series is great, but there's no way that I'll ever spend $30-35 more when I can get the TT Pro .46