This is a way to add a front picatinny rail to the Ruger Mark IV if you live in a state where you can't get a Tactical model and still want to mount a laser under your barrel. This remix will allow you to use the stock front sight and is secured by two M3 bolts with washers and nuts.
The author remixed this model.
I split the original to use the stock front sight as well as added bolt ears to cinch the sleeve tight.