You may remember the Limitless Gear OPFOR magazine carrier from their attempt to crowd fund it’s launch. It has now successfully entered production and is available for purchase.
The OPFOR is unique among magazine carriers in that it can be attached to and removed from standard PALS webbing with very little effort. This allows the user to rapidly reconfigure their gear to suit their needs. The OPFOR retains the magazine aggressively enough that it can actually be used upside down. Other interesting features include the ability to stack them on top of each other and a respectable 2.8 ounce weight.
Check out the Limitless Gear OPFOR.