The Effin-A series features DIY porting. The devices come with all ports open so you can shoot a group while feeling how your muzzle moves. Then, plug the ports with the included threaded inserts till you've tuned out all the muzzle rise and shift. Ares says this can be done on the range in as little as three strings of shots.
The port plugs screw in with an included Allen wrench. The instructions say they only need to be bottomed out, though I wonder if Loctite would help keep the screws in place or just burn off. (The threads stop short of the devices chamber, so you can't accidentally tighten the port screws into the path of a round.) We'll get the Effin-A on the range and let you know how it does.
Ares is also releasing a new stainless finish for the Effin-A, though we haven't seen it, yet.
