The Pac-Lite Holster is the perfect holster for all Ruger Mark I, II, III, IV, and 22/45 pistol owners. Due to the open slot on the top of the holster and the open end of the holster, this holster allows use with or without optics and with or without a suppressor. This holster is ambidextrous, durable, and lightweight. It accommodates up to 2" belt sizes and is made of rigid polymer material.FeaturesUse with or without optics: The open slot on the top allows use with opticsUse with or without a suppressor or compensator: The open end of the holster allows use with a suppressor, 1.0" OD** or smaller, or compensator attached to the pistol muzzleLightweight: Made of a lightweight polymer materialAmbidextrous: Perfect for left or right handed shooters Customized quick & easy pistol removal: Adjustable tension allows customized tension on the pistol for individual user preference