It is easy to convert to a DM (detachable magazine) but requires some cabinet work to make it neat.
The magazine yo posted requires the matching trigger guard (called a DM floor plate/trigger guard). To install the floor plate, you may have to dremmel out the cutout in your stock just a little.
Then you'll see that you need a cutout in your stock for the magazines--about 1/4" by 1 1/4" on both sides. Easy to do if you aren't worried about looks but more challenging to make look professional. Depending on your stock and your level of talent and cabinetwork experience, you may want to get that done.
If you do it yourself it is about $100 in parts.