First impressions: Looks to be the same size ports as a regular MB556. The MB556 works fine so this should as well. I can see where they cut back on costs, comes in a cardboard box, crush washer, and simple instructions. Looks like they're planning to release a flash hider along with this. 3P Eliminator Flash Hider. The finish is really rough with tool marks, and really shallow name engraving for PROCOMP and Surefire. It is a pure basic form of the MB556, which is what I expected to get for $52 street for these.
In comparison to other brakes it is relatively the same size as the MB556's. I threw in a Battlecomp BABC to show size relation compared to a Battlecomp 1.0. Left to right - Spikes Dynacomp, Fortis RED, Rainier Arms XTC, Battlecomp 1.0, Surefire MB556K, Surefire Procomp, and Battlecomp BABC. I'll be taking it out for some shooting and comparing to a regular MB556, and a Battlecomp 2.0.