Add me to the camp of failed E-Lander users. The 24rd EL mags worked for the first few outings, but shooting suppressed gummed them up quick and I didn't like the uncertainty of the mags working or the idea of needing to clean them after every range trip.
On a whim, I loaded up one of the 28/29rd ASC 7.62x39 mags I've had for over a decade and it ran great. These mags have been used extensively on a suppressed 7.5" 7.62x39 AR upper in semi and full auto and just keep chugging along. I know ASC and CPD have changed hands a few times over the years, so banking on current production mags running exactly like one that's 14+ years old in a crap shoot. I'd pick up a single mag from E-Lander (24rd), CPD (26rd), and ASC (25rd) and see which your rifle/ammo combo likes before ordering a dozen. You could also just limit yourself to the lower capacity (<20rd) mags as they seem to be far less finnicky from gun to gun.