I'm not sure what you mean by that... both the 5.1 and the 4.3 are built on the exact same principles, they are both based off the 2011 build, and both have a mid-frame. I don't see how a mid-frame takes off recoil... could you explain your thought process on that one? I'm curious.
Advantages and disadvantages of both:
5.1 may have a slight edge due to the longer barrel length
Again, the 5.1 may have a slight edge in velocity due to the longer barrel length
The 4.3 may actually take an edge for cycling speed due to the marginally lighter slide.
I use both 4.3 and 5.1, although you may not recognize them as such.
Last edited by ILLusion; January 28th, 2009 at 23:02..