What's in the Box Maxim Defense Mark IV-SD 22LR Semi-Auto Pistol w/ Integral Suppressor (1) 10-Round Magazine Cable Lock Owner's Manual The Maxim Defense Mark IV-SD isn t just another suppressed Ruger Mark IV . They infuse their M-Kore Technology for the best shooting experience possible out of this effective platform. Taking inspiration from the venerable MP5SD, They add a diffuser and port the barrel to bleed gas into the diffuser. This slows down supersonic ammunition to subsonic speeds before leaving the barrel, making their MKIV-SD series some of the most versatile and quiet in its category. Firearm Features M-Kore Technology Simple 3-piece design Integrated carbon cutters for easy tube cleaning No detectable first-round pop User serviceable Firearm Specifications Manufacturer: Maxim Defense Model: Mark IV-SD Caliber: 22LR Barrel Length: 3.75" Suppressor Length: 7.25" Finish: Black Magazine Capacity: 10 Rounds