I recently took a Model 1100 in on trade and not being as versed in shotguns as I am in rifles and pistols, I failed to notice something strange. This gun has beautiful wood and I'd say the finish is 98-99% but the barrel is extremely short......about 24" and has a screw in Improved Choke. The barrel has vent ribs with a red site dot about half way down and a white dot at the barrel end. The barrel is stamped Mod (which I know is modified) and I screwed out the choke and it's make with an capital I which I assume stands for Improved. I didn't realize that Remington made Model 1100 with replaceable chokes. Any thoughts? Maybe someone bored and threaded the barrel for chokes. If so.......they did a great job. This gun even has scroll work on the bolt assembly. Any ideal of the value? Again I'm not very knowledgeable on shotguns.