The Ruger Mark IV 22/45 is a semi-automatic .22 LR pistol built on a polymer frame that mimics the grip angle of a 1911. The 5.5-inch barrel, 10+1 capacity, and blued finish make it a natural fit for target shooting and general range use. At 2.15 lbs (34.40 oz) and 9.75 inches overall, it's a full-size rimfire that holds its own in competitive and training settings. 
 

Key Specifications 

• Brand: Ruger 
• Model Name: Mark IV 22/45 
• Caliber: .22 LR 
• Action Type: Semi-Automatic 
• Barrel Length: 5.5 inches 
• Capacity: 10+1 rounds 
• Weight: 2.15 lbs (34.40 oz) 
• Overall Length (OAL): 9.75 inches 
• Finish: Blued 
• Grip Material: Black Checkered Polymer 
• Sights: Fixed Front & Adjustable Rear 
   

Detailed Features 

1. One-button Takedown: Field-strip it without tools. Push the button, tip the upper off the grip frame, done. Cleaning and reassembly take a fraction of the time compared to earlier Mark series pistols. 
2. Cold Hammer Forged Barrel: The rifling is precise and consistent, which shows in tight groups downrange. 
3. Ergonomic Grip Design: The checkered polymer grip provides a secure hold during extended sessions. The 22/45 frame matches 1911 grip angle, which makes it a useful dry-fire and trigger-time companion for 1911 shooters. 
4. Internal Cylindrical Bolt Construction: The bolt doesn't slide externally like a traditional pistol slide. This keeps the sights fixed relative to the bore, which helps accuracy. 
5. Adjustable Sights: The adjustable rear sight lets you dial in windage and elevation for your preferred load.

The Ruger Mark IV 22/45 draws consistent praise from a wide range of .22 LR pistol users, with the one-button takedown receiving the most enthusiastic feedback. Owners across experience levels appreciate how much easier cleanup is compared to older Mark series pistols. It's a concrete improvement that gets mentioned in nearly every discussion.

Accuracy gets high marks. Shooters report tight groups at typical pistol distances, and the fixed sight picture from the cylindrical bolt design is credited for that consistency.

The 22/45 grip angle appeals specifically to 1911 shooters who want a low-cost platform for building trigger time. That's a specific niche, but it matters to people in it.

Some owners report feeding issues with certain budget .22 LR ammunition, which is common across rimfire pistols. The Mark IV handles quality ammunition reliably; bulk-pack performance varies.

The adjustable rear sight and aftermarket support get positive mentions from those who want to run optics or modify their setup. The platform has a large aftermarket ecosystem.