If they don't then it usually just requires a little bit of modification. (ie. filing down edges or, increasing the width or something)
STAR is decent enough. I mean I run them, a few problems but nothing major. Remember you get what you pay for. BUT at the same time they're so cheap you can lose/break them and you're only out like $8 rather than losing a $15-20+ mag.
PS: If you encounter the Magpul "Green Label" mags, the OEM manufacturer is STAR.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE