We were trying to duplicate the Edge's in a smaller package....I don't think the gas even makes it to the 4th port....recoil is about like a 22lr though....We ran a scenerio at a tac match that was as follows:
there was a 2" steel disc on a pivot that swung side to side around a "hostage" head. The target was at 200yds. The game was shooter A shoots it on the left side, then when it swings around shooter B shoots and the game continues back and forth...3 shots each. We shot the stage in less than 7 seconds!!!! They couldn't get the stop watch stopped fast enough...We like the 4 port DE brakes very much on these rifles.
It does seem kinda wimpy though at times.