BGS is a well established Slovenian brand that manufactures market leading kydex holsters and mag carriers. All products are superbly built and should last you a lifetime (precision made by vacuum forming 2 mm Kydex T on a CNC machined mold).
 
Suitable for any AR-type magazines - from your metal GI mags to all generations of PMAGs and other polymer variants - and for airsoft or real ARs, with easily adjustable retention via the two screws on the side.
 
T-LOK OWB belt attachments feature a universal 9-hole mounting pattern, making the carry angle of the mag carrier fully adjustable. Removable horizontal spacers enable snug mounting to any belt up to 60 mm (2.36’’) wide. T-LOK securely locks on the shooter’s belt using two side tabs under spring tension.