Caldwell ar-15 picatinny rail brass catcher - Caldwell AR-15 Picatinny Rail Brass Catcher

I used to have the Velcro versions, which were ok. This one can be easily moved from one firearm to another by purchasing the spare mounts, this slides on easy and has a deep pocket so brass will fall to the bottom and not get stuck. Very sturdy mount and wire form.
One thing that can be a issue is how to adjust the arm that connects it to the bracket, you have to take the basket mesh off then adjust and tighten. That's no big deal but you will have to ensure each weapon has the same location for mounting.