Canjar did indeed make a SST for the 1903, and I own a brand new NOS one, complete with the ultra-rare optional sliding tang safety. Have used them in the past with good success, but please be advised that extensive tests have revealed that any set triggers usually (always, in the testing!) cause a small loss of accuracy when shooting from the benchrest. Their use can make offhand or otherwise wobbly shots somewhat easier in the field, but please don't think that you're gonna win any serious benchrest matches.

They're still one of my favorite things, though.
Regards, Joe

You can lead a man to logic but you can't make him think. NRA Life since 1976. God bless America!