Gatsby

R barrel is 0.727" L is 0.726"
Forcing cone on choke tube, back bored a little.
Choke tubes are straight bored (No choke) extended full rifled 1:32" 0.730" groove
around 0.723" lands ( difficult to measure ) was going to gage it but gage set stops at 0.700"

Tinker

No offense, Yes I have a lathe and bridgeport.
You are hell bent on trying to get me to shoot BP, yuck !!!
I will post some pics of the gun and the 1/4 rib and sights I made.
Here is a pic of a mount I made for my K-gun.
Weaver steel barstock.

I will let you all know how it turns out.

Cheers
Nitro