50 450 ar15 mag

[milltownhunter]

I just picked up a 450 bushmaster upper and a 50 Beowulf upper and was looking at the mags the Beowulf look just like gi mags with a little lip mod. fallower looks like gi could std gi be ground a little to work? the bushmaster is the same with a different follower can you buy followers and mod gi mags? the 6.8 spc I am out of luck with need to buy 6.8 mags. I have about 60 gi mags

[Earlwb]

There is someone selling the single stack followers on EBay. Some online gun stores sell it too. You can buy the magazines already setup for it too. Primary Arms is one source.