T.Rex Arms feature the Esstac KYWI Pouches which are available at their online store for this video... "With A straight forward, user friendly and highly intuitive design the KYWI mag pouch is like no other. Utilizing a hybrid kydex and nylon design, you get all the rigidity you would expect from a kydex pouch and the lack of noise you want from a nylon pouch. These pouches feature Esstac’s Kydex wedge insert (KYWI) that provide the needed retention to secure your magazines without the need for bungee cord for rapid mag changes.

Each KYWI Pouch includes the necessary malice clips to attach it to MOLLE gear."