Just bought a few today.
They are slightly shorter than a USGI mag, and will hang up rounds if they are loaded long.
I didn't put the callipers to them, but I tried loading some handloads that were 2.265" oal and the tip of some of the rounds (77smk) were dragging at the front inside of the mag.
If you are using handloads, it would be wise to play it safe at 2.250" (or even less) oal.
Great mags overall. The only nice to have on them that I could see adding to future orders is the two indents for USGI stripper clip guides, and maybe an optional add-on base to allow easier monopoding off a mag in the prone.