You will be best served with dedicated .223 magazines.
Weigers, Romanian Weiger knockoffs, Bulgarian .223 waffle mags are all functional.
Converted Ak74 mags don't work well, even with the special follower. The curvature of the 5.45x39 magazine restricts max loading of 5.56x45 to no more than 15 or 20 before binding occurs.
You can see the differences in the below picture.
Far left: Bulgarian 5.56x45 ( .223 Remington ) waffle mag
Far right: Bulgarian 5.45x39 AK74 mag