The QB is an outside the waistband holster perfect for general range use, competition or concealed carry. The QB has a quick on and off attachment and will work in any competitive shooting sport.The all Kydex body provides a rigid material that is custom fit to each firearm and maintains its shape even with the pistol un-holstered. The open ended body allows use of firearms of varying lengths.The dual sided multi option mounting block allows user to wear left or right handed. The mount holes are compatible with all industry mounting options for belt, molle or thigh holsters. The holster accommodates up to .5 high night sights, suppressor sights and rear sight mounted optics. It has a push-button mount for fast, simple attachment to belts, easy to adjust belt width, locking button for worry free security and multiple holes for 270 cant adjustment This holster is approved for use in all competitive shooting sports: USPSA, IDPA, 3 Gun. The size 4 holster fits- 1911s; Colt; Remington; Kimber; Sprinfield all models including TRP half and full rail; all Mil-Spec.