A long time ago..well, maybe around 1987, I was in my short barreled revolver phase. I picked up a 29 and a 657 with 3" barrels...lots of fun to shoot, but haven't seen much use. I've tried the internet, but no luck in finding out if these are rare, or even if they are actual factory units. Anybody know anything about these short barreled N frames? Seems that the 4" units are the smallest offered for sale now.