Based on many reviews I have read on factory magazines from Savage for the model 10 I decide to find a substitute. Thankfully I have been successful. It is a plastic magazine but it fits and functions perfectly. It is made by Pmag. There is no serial or part numbers, only the patent #, EN: 337-0170. I found it by pressing a friend of mine working at Cabela's in Marysville, WA. I did not check Pmag website so if you are sick of model 10 mags that don't work give them a try. You won't be disappointed.