I just ran across a site from a company named I. Q. Munitions out of Montana making what appears to be high quality aluminum alloy 10 round mags for the Deerfield and M77 .44 Mag https://www.iqmunitions.com/product/ruger-44-magnum-10-round-magazine/ Going rate is $140 each. Kinda steep but they do look first rate and I own both rifles it’s compatible with so I’m rationalizing that the mag would only cost me $70 per rifle. Anybody here have any firsthand info on one? I have never seen any discussion on THR or anywhere else that I remember. I might drive through the town where the company is located just south of Missoula in about 3 weeks and see what I can find out.