3D printed Mossberg 500/590/835 4x shell holder This design utilizes the existing picatinny rail screw holes on the Mossberg 500, 590 and 835. it holds 4 extra shells on the side of the shotgun. I used M4X8 hex head screws to attach to the shotgun. Which are included in sale. I have hunted with this attached to my Mossberg with no issues and without the shells falling out. you can also wrap it in camo to blend in with a wrapped shotgun Two designs available, with picatinny rail and without Shipping available.