The insert is compatible exclusively with the Micro Fight MK4 and MK3 Chassis, not with MK2, MK1, or plate carrier kangaroo pouches.
Designed for submachine guns, the insert can carry 4 magazines in one pocket or 8 in total by using both front and rear pockets of the Micro Fight Chest Rig Chassis.
There are two types of SMG Magazine Inserts to fit a variety of magazines, and while not all have been tested, those similar in size to listed ones should fit due to the elastic nature of the insert.