I bought two 5 round mag’s for my old Winchesters, one rifle did not have a mag and I want to preserve the 97 year old mag from the M57. I ordered them from SARCO Inc. After a couple of range trips, one of the springs broke inside the one I was using in my M75. I contacted them and they sent me a replacement without any hassle or even having to send back the defective mag. You can’t ask for better service than that IMO!