The plain jane - HERA Arms 1313B H1 223 Remington/5.56 NATO 10 Rd AR-15 Polymer Black Finish

AS is with the FDE/tan mag, it is slightly thicker feed lips so it flexes less with temperature changes, and the thicker lips mean it is more adaptable to alternative rounds use, like 300 Blackout or 458 Socom. When used prone for 5.56 the shorter body means you can get lower on hard ground than with longer mags. I recommend color code to keep various types of ammunition separate and being available in several colors helps, as would wrapping a colored tape around it or painting a band on it to help keep them apart, but for me the black is long range 5.56 ball, and this is just small enough to tuck in a shirt pocket, too.