This is a wall mountable gun rack that I designed. Each piece can hold two long guns. It was designed to be able to stack them using a guide pin design on each end so you can just keep adding two at a time as you need more. They have several screw holes in them to be able to mount them to a wall, board, etc. I tried to space them out so that when you connect two of them the end screw holes are around 16 inches for standard studs in a home. But the easiest way is going to be to mount a 1x3 or 1x4 pine board across the wall secured to the studs and then secure the rack itself to the board. I also designed the retaining clip (Best I could come up with) that slide in the front and in most cases for most long guns will keep it from falling out. I plan to tweak it as I go, it isn't a perfect model, but it does the job and is sturdy. I started with 15% infill but it could probably be done with 8 or 10, it's quite sturdy and only needs to keep the gun from falling over. I hope you enjoy!