The Ruger Mark IV 22/45 Lite is a semi-automatic .22 LR pistol with a ventilated aerospace-grade aluminum receiver, cold hammer-forged stainless steel barrel, and polymer grip frame. It holds 10+1 rounds, has a 4.4-inch threaded barrel (1/2"-28), and weighs approximately 25 oz. Finish is stainless and black (clear anodized). 
 

Key Specifications 

• Brand: Ruger 
• Model: Mark IV 22/45 Lite 
• Caliber: .22 LR 
• Action Type: Semi-Automatic (Single Action) 
• Capacity: 10+1 rounds 
• Barrel Length: 4.4 inches 
• Weight: 3.8 lbs (approximately 25 oz) 
• Finish: Stainless and Black (Clear Anodized) 
• Sights: Fixed Front & Adjustable Rear 
   

Detailed Features 

 
The one-button takedown lets you field-strip for cleaning from chamber to muzzle without tools -- a major improvement over earlier Mark series designs. The aluminum receiver keeps weight down while the cold hammer-forged barrel gives consistent rifling. The threaded muzzle (1/2"-28) is compatible with suppressors and other muzzle accessories. The polymer grip is checkered in a 1911-style pattern, which most shooters find natural for a positive hold.

Owners of the Mark IV 22/45 Lite consistently mention accuracy and light weight as the main reasons they bought it. The .22 LR caliber keeps practice costs down and recoil manageable, which makes it popular for both new and experienced shooters.

The simplified takedown gets frequent praise -- cleaning is much easier than the older Mark series, and most owners find it intuitive after the first time.

Critical feedback is relatively minor. Some users find 10 rounds per magazine limiting compared to other .22 pistols. A few note the grip doesn't fit larger hands as well as they'd like. Neither issue is a deal-breaker for most owners, and overall sentiment is strongly positive.