http://www.ar15news.com/2012/09/25/awesome-muzzle-device-comparison-video/
Worth the watch.
Video doesn’t seem to work.
Same video series on Youtube:
http://www.youtube.com/watch?v=ZtVB4IubWyc
Youtube works and you can control/improve the quality.
Just picked up two M4SD-II compensators in a group buy on a suppressor of the same name and am looking forward to testing them out this weekend.
Probably won’t get to test them with the suppressor until sometime in 2013, however…