As I mentioned before, I have several different mags for my Romanian SAR 3 5.56x45 AK. I love AK type rifles in 5.56x45, but the lack of standardized mags is a bit of a drawback. However, with a bit of modification, several types of magazines can be used. A few do not even need to be moded.
The rifle came with what I believe is a modified AK 74 mag done by CAI. The floorplate says .223, but it only feeds well with about 20 rounds. I bought some Bulgy AK 74 mags and loaded them each with 20 rounds (I didn't try to load more than that). They worked really well and I didn't even have to mod them! The mags only cost $10 each. I also took some Bulgarian "Circle 10" 5.56x45 mags that I moded by filing down the back a bit. Those work the best. No feeding issues at all. I really like my Romy SAR 3.