1791's MAG-F double mag carrier fitted with a retention screw; the MAG-F allows you to adjust the retention of the holster to your preference. This allows you to use different polymer and metal single or double stack magazines in the same carrier.
Specifications:

Type	Double Mag Holder
Color	Brown
Material	Leather
Size
Model	MAGF
Finish
Model Fit
Mount Type	Belt Loop
Belt Size
Shell Count
Caliber or Gauge
Compartments	2