The M22 Universal Ammo Pouch from Built for Battle adapts to the way you operate. Mags can be secured by either Velcro, popper studs or shock cord. Top popper is for AK's, bttom one for SA80/M4's.
Pouch flap is made for a double layer of webbing to give maximum protection from wear and tear when lying prone. CQB ready, just roll the flap up and secure with velcro at the top, or just tuck in down the back. Even use to secure your pistol with the shock cord. This is probably one of the toughest and most versatile mag pouches we've come across.