Thanks to Military Moron for his help during beta testing / development, and also in getting this review out.
Quote:
Bottom line/conclusions - The M4SD II Flash Comp is my favourite all-round muzzle device at the time of this writing as it strikes a good balance between compensation, concussion and flash. It's the most effective one I've tried so far; even better than the Muzzle Brake but without the concussion. I found it to be an improvement over the original M4SD Compensator as the amount of compensation was better dialed in for my setup.
http://www.militarymorons.com/weapons/ar.access2.html#griffinfc