Polenar Tactical is offering these mag pouches for AK mags. They are made by Stich Profi in Russia. They retail for €32,00 from Polenar Tactical. You can also get them from Stich Profi in Russia for €26.64. The pouch is unidirectional. They have a left and right handed version. They hold the mags bullets down so you can use the beer can grip to draw them out. From the video below, it looks like they are rocked out to release from the mag pouch.

Here is a video from Stich Profi.