Made the choice for a 4" barrel 617 since my daughter will be inheriting it in time. The comments were enough to convince me. My other (3) revolvers are 6" barrel already, but no full underlug. GB had one that was 3 years old, only had one cylinder full through it so leaped on it. Will see what turns up to my local FFL. Where did you guys get those fancy S&W scales with finger grooves? Thanks for all the helpful comments.