These are great mags. I got a mess of 7.62x39's when they were $5 each. Got another mess of 5.56 ones for the SAR3. Bunches and bunch of rounds through them with no troubles as all! When my new AIMS is done beeing assembled, I plan to get a pile of the 5.45 version of the ACU mags.
They work. I'd not pay $11 a pop for them. RTG has the best price, same price for 30 & 40 rounders. Metal front and rear lugs. I used them in 3 different pre-89s, a DDI milled parts build and a Arsenal. All worked with no issues, feeds fine and no issues with the followers in any of them.