I bought a 1903A3 some time ago, but have only recently devoted some time to it. It groups very nicely, but consistently about 10" high at 100 yds. I checked the tension on the barrel lugs, and tightened them according to the old TM, and test fired it again with no visible difference in performance. My next thought is to replace the front sight blade, as the old one seems to be worn, and I can't rule out the possibility that the previous owner may have tried to modify it in some way.
Am I on the right track? Or are there other troubleshooting steps I should take first?