Atlas mag issue with Prodigy

Quick question for the group, I’ve got a prodigy And recently ordered a few atlas mags to try out. Haven’t had any issues with the duramags at all but need some more anyways. The 20 round atlas mags (140mm) fit no problem and are flawless. The 17 round mags (126mm) are too short to seat properly. What’s the easiest solution to get them to fit? Thanks, newbie to 2011s. So far I’m addicted but obviously plenty to learn.