I have a Kimber Pro Carry 2. While it looks like a 1911, there's no barrel bushing, so for purists, it's not really a JMB 1911. But it's a pretty good gun, and quite accurate, and I got a good deal on it. There is not a firing pin block as such. It's a firing pin shroud, which requires the hammer to overcome spring pressure. I've not noticed any appreciable difference in the trigger from any Series 70 1911. The trigger is a little rough, but is consistent with no take up and no over travel. The trigger is not as smooth as my Desert Eagle 1911C, but it seems to lack the "bad" characteristics of the series 80 blocks. While I pefer a series 70, my reasoning is the KISS principle. Fewer moving parts, less chance of failure. And the argument with regards to competition shooters needing a Series 70 is kind of moot. A light trigger is important. But to go along with the light trigger is the consistency. At least in Bullseye Competition. The gun has to go bang at the same place in the trigger travel every time, and the reset has to be the same every time.