Also, boy412, your sight is a Type II which is milled and is the best of the three configurations of sights installed on carbines, as far as accuracy. Type II sights weren't available until 1944. After installation, the sight was staked in place with a punch. Also the left side of the dovetail, under the sight, is narrower than the right to assure proper assembly and tightness. Me, I wouldn't mess with the sight.
All U.S. M1 Carbines were produced during WWII and have been to war. There's not a perfect original carbine, unless somebody totally refinished it. At the end of the war, all carbines in service were configured or reconfigured to the version you have. If it was mine, I'd leave it like it is to keep the history that it's been thru. You've got a very nice carbine.
Well, the meeting is about over.... Here's one of my Inland shooters with a Ruger Blackhawk also in .30 Carbine:
