Don't get excited!.....I actually think KIDD642's is a 3.5" ........

(I can't believe I just said that.[:'(])

I never did measure it but I'm pretty sure it's over 3" anyway. It's a prototype that Jerry made for me a while back that's how I know. I currently have Kidd's 4" Stealth as a side/back weight counterbalance for 3D, and he has my prototype.