I fabricated this bottom metal to use AI magazines on my savage .300 win mag. I know CDI makes a great product, but I wanted to take on the project. This same process could apply to any bolt action. I salvaged the aluminum from some scrap in the dumpster at work and bought all the screws ect from ACE. I used a 4.5" grinder, drill press, files, dremel ect. to do the work. Mostly the stuff any guy has in his garage.