I just acquired Model 2000 and am in the process of cleaning it up and refinishing the stock. When I pulled the stock off I noticed that there is a place for a magazine and a false magazine inserted. It looks like it will be quite easy to modify the gun to hold a real magazine. Is there a kit that I can buy or do I just need to buy a magazine and modify the aluminum bottom rail? Doe this gun use a standard magazine that Marlin sells?