The NAA MiniMaster is a .22 LR single-action revolver with a 4-inch barrel, 5-round capacity, stainless steel construction, Marble Arms adjustable sights, and large black finger-grooved rubber grips. Weight is 10.8 oz (0.7 lbs). 
 

Key Specifications 

• Brand: North American Arms (NAA) 
• Model Name: MiniMaster 
• Caliber: .22 LR 
• Action: Single Action Only (SAO) 
• Capacity: 5 rounds 
• Barrel Length: 4 inches 
• Overall Length: 7.88 inches 
• Weight: 0.7 lbs (10.8 oz) 
• Sights: Adjustable Marble Arms Front & Rear 
• Grip Type: Black Finger Grooved Rubber 
• Finish: Stainless Steel 
   

Detailed Features 

The 4-inch barrel is long for the NAA Mini line and provides a more stable sight radius than the standard short-barrel versions. Marble Arms adjustable sights allow the shooter to dial in a precise zero for a specific load, which is useful for consistent target work at rimfire distances. The large rubber finger-grooved grips give better hand control than the standard small grip panels. Stainless steel construction resists corrosion without much maintenance. At 10.8 oz and 7.88 inches overall the MiniMaster is still compact, though the 4-inch barrel makes it less pocket-friendly than shorter NAA variants.

The MiniMaster sits in a specific niche: it is the most capable configuration in the NAA Mini revolver line for target shooting, with the adjustable sights and 4-inch barrel offering more precision than the compact backup-only variants. Owners who buy it for deliberate accuracy work at rimfire distances are generally satisfied with that specific use case.

The stainless finish is praised for durability and outdoor suitability. The adjustable sights are mentioned as the primary upgrade over standard mini revolvers.

Common criticisms focus on what .22 LR and 5-round single-action capacity inherently cannot deliver compared to larger defensive handguns. Owners with larger hands sometimes find the grip dimensions limit comfort. Certain ammunition types can cause reliability issues, and experienced owners typically suggest testing several brands before settling on one. The revolver's role as a defensive tool versus a range curiosity generates ongoing debate among mini revolver enthusiasts.