Monstrum Side Saddle Shotgun Shell Holder V2 for Mossberg 590

This side saddle is well-made and fits my 590 Shockwave shotgun perfectly. To install it, apply some gun oil to the bottom of the saddle to ensure a smooth slide onto the shotgun, preventing any scratches. The main screw is a bit tight and requires pushing through the back of the shotgun to secure it. Otherwise, there are no major installation issues. In terms of improvements, I would like the hardware to be flush, without a nut on the back to secure the screw.