This is a magazine carrier for the CZ Scorpion line of rifles and pistols. This pouch comes with the attachment that you order. This mag pouch also features adjustable tension. This pouch can be had bullets forward or backward at your request. Additionally you can order closed front for more rigidity, or open front for more speed.
The double layers on closed front can be very rigid.
You must specify right or left side carry. This tells me what side the pouch will be mounted on.