Where to find Pre 1994 MA legal 20+ round AR-10 mags?

[hv55maxx]

So I read through this and really no solution with converting available pre bans to work in SR25 pattern lower? I’m willing to hack up a FAL or an M14 if it’s doable (successfully done the Uzi to Colt 9mm conversions)

 

[Yazz]

My ar 10 uses G3 mags. Other than that you need an M14 a Hk which uses g3 mags or a Springfield 48 to find pre ban mags. And good luck with that.