This is a DeSantis Gunhide Magazine Pouch known as the Quantico, model A86KJYYZ0.
The Quantico(TM) Single Mag Pouch features dual tensioning devices and Kydex(R) construction and fits up to 1 3/4" belts.
Features:
Features dual tensioning devices
Kydex® construction
Fits up to 1 3/4 belts.