Ruger 10/22 Dual Magazine Coupler

thingiverse

This coupler can hold two Ruger BX-1 magazines together like similar products you can buy. It relies on having a very snug fit in the bottom of the magazine with a recessed locking plate that holds them together. If you yank on them, they will pop apart but I've used it out in the field for two years now and hever accidentally had them come apart. It's super useful for being able to remove the magazine from the bottom of the gun too as they're fiddly to get out. It needs an M4 screw which I used a grinder (a file or dremel would work) to flatten one edge to key it into the thumb screw piece.