I have found a fairly rare variation of LC. The problem is the barrels have been cut. How much would this degrade the value? The rest of the condition is fairly straight forward, some original finish, re-done wood and checkering re-cut. Do any of you have a rule of thumb when figuring amount of value decrease of modification to the overall rarity of a certain gauge within a specific grade, ie. there are less than 20 20ga. Pigeon grade guns? Thanks for your thoughts. Mark PS it isn't a 20ga. pigeon gun