My first question is:What is/are the diff. between the .223 mags and the .308 mags (size wise)? Second question: Where on gods green earth can u find .308 mags. Ive been to rock rivers nope, searched online and can only find .223. When I ordered my ar I bought 4 FAL mags. Are these mags any good. Any one else use them for their .308? Thanks ahead for any insght.