I don't understand why people think there something wrong with the pinch style vs the the style bolted from the top? All that holds the RPG bump in is the nut on the top if that nut were to come loose what happens to the bump?, and all the force is put on that top cap when they go into compression .... In the pinch style like outlaw and icon set ups there is a mechined lip on the bump that bottoms on the mount, it WILL NOT go past that lip. Also you have to spread the mount to get the bumps installed, you could remove the bolts and you still can't pull the bump out without spreading the mount to take them out. The force from compression is transferred through the whole mount.
Another thing is the mounts themself, the RPG kit does not fully box the frame, so their mount really only has one upright per side to bend if you were to have a extream impact, probably why that kit failed in the earlier post. The outlaw and icon kits both box the frame with plates on both the inside and outside, we all know it would be harder to bend two upright pieces of steal vs one.