I couldn't begin to venture a guess on the gun's value. I will tell you that you have some pretty nice add on features though. That Kart barrel is well known as the most accurate barrel for 45 ACP. Sounds like your gun has had a trigger job as well as it is near impossible to get a manufacturer to build a gun with a sub 4 lb trigger. The sights are a nice add-on as well. Sounds like you are well set up. Now, just take it out and shoot the crap out of it. That will tell you it's real value.