I have an old pre-27 3 1/2" bbl. around here somewhere. It came with regular hammer,trigger and front sight along with magna grips. Target stocks do look a little out of place on a short-barreled revolver but, I guess it could have came that way if you ordered it.
Here are a couple of pics of my Model 27-2 with a 6" bbl. (shipped in 1976) and all original target grips, hammer, trigger and a patridge front sight. Great shooting revolver and I am sure you will love yours also.