It's a centerfeed detachable box magazine. Your best bet is to call Savage customer service directly and order one (don't forget to specify gloss or matte, the 11 fcxp3 should be gloss). Savage customer service is great and they ship quickly. You could also try Sharp Shooter Supply, Northland Shooter Supply or the classifieds on this site. You'll have to have a paid membership to veiw the classifieds.