I suspect it was only buckshot for the 2 rapid fire strings at the start if the (first) video.Really most applicable to semi-auto but yes it works for both. The push-pull method and fighting stance gets me goimg pretty quick with an M2. In the video, I'm not convinced they were shooting full power buckshot, but I could be wrong.
Folks gotta feed their new Turkish shotties.😀And suddenly shotshell sales went up.