The Ruger Mark IV 22/45 Lite is a semi-automatic .22 LR pistol with an OD Green anodized aluminum upper and black polymer lower. At 25 oz with a 4.4-inch cold hammer-forged barrel, it's light enough to shoot all day without fatigue. Two 10-round magazines are included. 
 

Key Specifications 

• Manufacturer: Ruger 
• Model: Mark IV 22/45 Lite 
• Caliber: .22 LR 
• Barrel Length: 4.4 inches 
• Capacity: 10 rounds (includes two magazines) 
• Weight: 25 oz (1.5625 lbs) 
• Finish Per Color: OD Green Anodized / Black Frame 
• Frame Material: Aluminum with Polymer components 
• Sights: Front Fixed | Rear Adjustable 
   

Detailed Features 

The polymer grip uses diamond checkering that holds well without being uncomfortable during long sessions. Field-stripping takes one button press and no tools — a genuine improvement over earlier Mark series pistols that required specific procedures to disassemble. 
 
The barrel is threaded 1/2x28 from the factory, so suppressor-ready use requires no gunsmith work. The manual thumb safety is accessible without shifting grip. 
 
The fixed front sight and adjustable rear let shooters dial in their zero, which is useful for target work where different ammunition can shift point of impact noticeably. 
 

Usage 

The 22/45 Lite is well-suited to target shooting and training. The .22 LR caliber keeps ammo costs low and recoil light, making it a practical platform for building fundamentals. The grip angle mirrors a 1911/Government pistol, which appeals to shooters who train on that platform and want to carry the muscle memory over. The threaded barrel opens suppressed use as a viable option without modification.

The Ruger Mark IV 22/45 Lite in OD Green draws consistently positive feedback, with most owners citing the lightweight build, ease of maintenance, and .22 LR running costs as the main reasons they recommend it.

The one-button takedown gets frequent praise — people who owned earlier Mark series pistols know how much of an improvement it is, and new owners appreciate not needing a manual to clean the gun. The grip feels natural for most hand sizes, and the diamond checkering keeps it in place during extended range sessions.

The threaded barrel draws interest from owners who want to run a suppressor. The 1/2x28 thread pitch is standard, so most common suppressors thread right on.

On the downside, some owners note that the lightweight aluminum construction means recoil is slightly more noticeable than on heavier steel-framed .22 pistols — still mild by any standard, but perceptible compared to a heavier gun. The magazine release is non-traditional in its placement and operation, which takes a short adjustment period for shooters coming from more conventional layouts.

Overall, the Mark IV 22/45 Lite is regularly recommended for target shooting and training, with the .22 LR caliber making it affordable to shoot in quantity.