My favorite shotgun when I was growing up was an old 16 guage that belonged to my grandfather. It was a single shot with a 30 inch barrel made by Iverjohson company.
Well my favorite is a Browning A5 12 ga with a fixed modified chokethat my grandfather gave me I dont use it very often though. I have the reciept from when he bought it at montgomery wardfor $118.25.
I was looking about getting an m2 last year, on there websight they have a video about the whole inertia system. I didnt buy it simply because it didnt fit me right.