This is a M16 mag carrier (fits all M16, AR15, CAR15, M4 magazines) This is a brand new in the wrapper Kydex magazine holder. This holder will accommodate either twenty or thirty round magazines, with only about two inches being inserted into the carrier. This holder also has a tensioner screw so you can adjust the snugness of the carrier. If you have not seen one of these they are the coolest, and go great on police duty belts (this model is a 1 3/4" loophole model most Sam Brown duty belts are 2" or slighty larger. Please let me know because I have both models.)This belt loop is for a 1 3/4" belt, and fits nicely on the Blackhawk CQB or Wilderness instructor belt. Many 3 gun competitors love these holders because of there versatility. This item comes with a one year manufacturer's warranty. Please e-mail me if you have any questions. Photos available upon request.