I'd use it just like they did in the film, get my gun nut friends to shoot it and laugh my butt off watching them. I watched the video twice and my sides were hurting after.
Only one guy, the 7th guy from last with the blue jean shorts, seemed to know what he was going to feel. He calmly fired, held on to the gun, then pulled the bolt to reload. The rest were a riot to watch. Many a sore shoulder that day.