I know this is kindof a Marq knockoff, but I just was fooling around.
The black things you see behind the "Cup bolt" are black rubber wing-like projections. The one on the top is to keep balls from falling behind the cup. The ones on the side (both sides) are for stability when the bolt is in it's foreward position (rides in a groove in the side of the body) and to keep air from traveling up the feedneck. As you can see, it kinda mimicks the Alien bolt designs, only allowing air to hit the bottom part of the ball.
The blue is orings. 3 in the design.
The bolt tip is made of rubber to help make it more gentile on paint.