Here is a very rare 41 mag. Serial # 397 with a 4-5/8" Barrel. Note that there is no "Inc" on the barrel address. VERY hard to find. I have seen several 6.5" non-inc guns but only a couple shortys. This one is about as close to 100% as I have seen.
while I dont believe in 100% guns either, this one rates 99%+ in my rating system. Don RENE lists 700 total guns of without the INC on the barrel. Somewhere I seem to remember that less than 25% were short barrels as in that time era 6.5" barrels were more popular, so that would mean around 175.