anyone know who can make a follower that's best suited for the cartridge? with ar10 mags mostly using the 308win as a base for all other cartridges to hopefully feed reliably they don't work to well when using short mag cartridges. getting past the mag swelling is 1 thing and lets say a 20 round mag that can only hold 14-16 short mag rounds capacity wise the problem is after 5 or 6 the cartridges don't sit correctly after 4 or 5. i've tried 10 round mags and it's the same issue. could 1 file the follower flat then somehow attach an insert/dummy round to the follower to get rid of the 308win cant? or is the mag shape the issue? some members on here do have short mag ar's i guess that have successful feeding from standard 308win mags?