Cool but flawed - SIG SAUER MCX/MPX Collapsible Stock

It's a really cool stock for the mpx. The mpx has slots for the rails machined into the upper so it looks like it belongs on it. The rubber butt pad is attached to the stock by slots and is kept in place by one plastic tab. This is an incredibly weak design. Mine came warped and bent and the pad slid off straight out of the box. When I tried to pull the tab into its normal place it broke off. I'm still waiting on my refund from op. Wish sig wasn't so cheap now. Long gone are the days of their German quality.