The Ruger 22/45 MKIV is the latest version of one of the best 22LR suppressor hosts available. The grip angle and controls are modeled after the iconic 1911 pistol, and will feel very familiar to most shooters. The MKIV features updated safety and slide controls, as well easier disassembly. The 1/2"x28 threaded barrel makes it suppressor ready out of the box with no additional adapters. These are the new bronze anodized upper receivers.