Here's the thread in our forum that explains it, photo courtesy of Jon C ;) https://www.m4carbine.net/showthread.php?t=112484
The BAD-CASS started life as a 3 way M16 selector, developed for one of the most well known, tradition rich firearms companies in the US, for its entry into the improved carbine trials.
The BAD-ASS, due to the conventional way the levers are attached to the selector center, does not leave any room for the M16 auto sear.
Since both our levers are detachable, we ran into this problem that a cast selector with its permanently attached left lever does not have, so we used the dovetail interface to create room for the auto sear cut on the center. This also serves the purpose of diminishing the role of the screw, so that in the event a user forgot to use thread locker on the screws and they fall out, the levers are not lost immediately, and actually remain usable for a time.
The BAD-ASS, with its tried and true, and rather conventional lever attachment system, has worked very well for its owners. We almost never hear of screws backing out, there was one known case where this did take place, the user forgot to apply thread locker on the screw. Also we do not know how he torqued the screws (the torque value is 5 inch / Lb).
It's been our experience, and that of many users, that even without thread locker, the screws have stayed put. We recommend always use a tiny drop of thread locker on the screws, this applies to many accessories on a firearm :)

