I've come to just really hate metal AICS mags and the only option for 223 is MDT's plastic 10 rounds. Mine works OK but the last one or two rounds out of it fail to feed rapidly about 50% of the time.
Do we know if they are AR-15 length magazines or 308 length? I load my 223 trainer out past factory length, and I like the extra mag length in the 308 mags from MDT.