I had a whole series of gunsmith cut 5" Smiths, K, L, N in the early days of IDPA. Then Bill decided that was not tackytickle and I had to have them sawn off to 4". Sure am glad I didn't have my Python cut off.
There is a series of full lug K38s; a friend shoots the fairly common 6" at PPC Distinguished but I would like to have one of the few 4" for IDPA. But they only made 350 of them for a dealer in Mississippi so they are more seen in speculators' hands than shooters'.