This is a simple little device to help load your Ruger Mark IV magazines. It should also work with Mark III magazines since they are cross-compatible. I am unsure if they work for Mark I and II magazines. To use, simply slot over the top of the magazine and pull down, then hold in place while you insert bullets. Print settings unimportant, use whatever has consistently worked for your machine.

The design is inspired by Magpul's offering.