Wow I’ve never seen a 4” pre 27. When I was First shopping around for a 27 I feel like I saw a lot of 4” 27-2 but by the time I was ready to buy all I could find were the 3.5” guns. Would really like to get my hands on an early one some day. It’s a real shame S&W didn’t produce more 4” N frames, I love the aesthetics of it and handling.