This is a very simply designed part that solves a functional and asthenic shortcoming of the AVA Bullpup. There was no support for the rear of the picatinny rail. There is already a mounting hole ready for an M4 countersunk screw, but no riser (support) to hold it up. With a medium to firm pressure with your finger you can see the rail flex under pressure. This part is solves the issue, AND provides an EASY install. I considered making this a part that went all the way around the shroud, but this would have greatly complicated the installation.
Remove your scope, snap the support onto the shroud ( It has a nice tight and firm snap onto the shroud) and slide it forward under the picatinny rail until the hole is aligned. Insert and tighten screw. The support has a steel nut recessed into it to accept the screw.