AR15 Brass Catcher for Mossberg 715T

This is a Brass Catcher specifically for the Mossberg 715T (Tactical 22).  I'm have another for the standard AR platform.  There are 2 main components to this.  The Brass Catcher, and the Rail Clamp.  The rail Clamp is secured to the rifle body around the ring just before the handgrip and locks around the bolt that protrudes out the bottom.  The Clamp tightens using 2 m3 by 20mm screws and 2 m3 nuts.   The Brass Catcher attaches to the clamp via the dovetail groove in the lower part of