Remix of Wormskill's brass catcher to not require any hardware and be AR10 compatible. Use a small hair tie or rubber bands to connect to picatinny rail.

I printed at 75% infill, with supports under the rubber band catch ledges. I blocked supports (in cura) all around the bag retaining edge. There was a small amount of stringing but I didn't feel like chipping supports out of the whole thing. Overall came out pretty good.

I printed very high infill to hopefully prevent the small cross braces that slide into the two pieces from snapping during 308 recoil.