I know that I can use DPMS mags, but will Armalite/Bushmaster/SR25/etc... also fit? I can order the DPMS for $40 each, but figured I would keep my eye out on classified boards for a good deal. Just want to make sure what I buy will work as well as the DPMS mags. Thanks in advance for any help.
Also, If anyone knows of any good deals or is selling their mags please let me know. Of course, as long as they will work.