From the Zoli competition catalog in PDF format. Page 66 has the stock specs.

Flat rib G/R stock parallel adjustable drop (comb) Monte Carlo in 12 gauge specs:

Drop at comb: 1.69" (43mm)
Drop at heel: 1.81" (46mm)
Drop at Monte Carlo: 2.28" (58mm)
Length at heel: 15" (381mm)
Length at toe: 15.35" (390mm)
Length of pull: 14.84" (377mm)

I have a very slightly used like new one as above, which I got a couple of days before my total shoulder replacement surgery. It will be at least another month before I can shoot it. Feels great in the hand and I've handled it a lot during recovery. I think I'm gonna like it.

 

Thanks!

 

I think Rob Carlson has a couple on his web site for sale, if you're interested.

 

Rob has one, an extra grade. The G stock has a little more drop than the current stock with a small Monte Carlo and the grip seems a bit more cylindrical. I have one. I like it. I like the current stock. I have to modify both to get what I need dimensionally.