The Ruger MK IV 22/45 Lite is a semi-automatic .22 LR pistol with a 4.4-inch threaded barrel (1/2"-28), red anodized aluminum frame, and gold trigger. It holds 10 rounds and weighs 25 oz. 
 

Key Specifications 

• Manufacturer: Ruger 
• Model: MK IV 22/45 Lite 
• Caliber: .22 LR 
• Capacity: 10 Rounds 
• Barrel Length: 4.4" 
• Finish: Red Anodized w/ Gold Trigger 
• Weight: 25 oz. 
• Material: Aluminum 
• Grip Style: Checkered 1911 Style with Polymer Frame 
• Sights: Fixed Front Sight & Adjustable Rear Sight 
   

Features 

 
The Mark IV's defining improvement over earlier generations is the one-button takedown. Push the button at the rear of the frame, hinge the action open, and the gun separates without tools — a real improvement over the MK III's disassembly that drove a lot of people nuts. 
 
The threaded barrel makes suppressor attachment straightforward. The 1911-style grip angle and checkered panels give the pistol a familiar feel for shooters used to that platform. Adjustable rear sight lets you dial in zero for your preferred ammo. 
 

Who It's For 

 
This is a range gun, a training tool, or a suppressor host. The .22 LR caliber and low recoil make it accessible for new shooters, and the 10-round capacity keeps range sessions moving. The red anodized finish is distinctive — it's a gun people notice on the firing line.

The Ruger MK IV 22/45 Lite in Red Anodized gets strong reviews overall, with a few recurring criticisms.

The one-button takedown is almost universally praised — owners who dealt with the MK III's notoriously frustrating disassembly process appreciate the improvement. Accuracy draws consistent praise for a .22 pistol, and the gun runs reliably across a wide range of .22 LR ammunition brands, which matters for owners who aren't particular about which bulk ammo they run.

The red anodized finish attracts attention and gets positive comments from shooters who want something other than the standard black or stainless look.

On the downside, price is the most common complaint. The MK IV 22/45 Lite costs more than some competitors, and some buyers feel the premium is hard to justify purely on performance grounds. Trigger feel divides opinion: most shooters are fine with it, but a subset finds the pull heavier or less crisp than they expected at this price point. A handful of owners report needing several hundred rounds before reliability fully settled in — a break-in period that's not unusual for rimfire pistols but worth knowing about. Magazine capacity at 10 rounds rarely comes up as a real problem, but it does get mentioned by shooters who prefer fewer reloads.