When I was on my first job with a PD in the 70's, all I had was the issued 4" M-10 HB that I was issued. I carried it in a cheap IWB holster until I got a Bianchi Pistol Pocket for it. I am 6'2" and a bit over 200 lbs and it concealed pretty well and didn't seem too heavy for me back than. Now that I am older and softer, I usually carry one of my J Frames or D Frame Colts but I think a 4" M19 is perfectly useable for concealed carry with a good belt and holster.