What was different on the rifle was the type of safety that had been installed on the rifle. The military "swing" safety had been removed and in it's place was a smaller lever that you grasped and rotated 180-degrees. It said "fire" on the top when it was in that position.
Does anybody know what the story is on these safeties?
Your post looked so lonely, with no replies.
I was hoping someone else would think of it. I have read about what you describe, and I'll be darned if I can remember whose it was. Niedner, perhaps? I'm pretty sure the source of this info was "Gunsmithing" by Dunlop. If I can find it again, I'll try e-mailing you.
Todd
Chic Worthing
Sounds like you might be talking about a Springfield '03-A3. It's safety is marked, while the mausers are not. There's one on the cover of Peterson's Rifleman mag. this month if you subscribe to that one.