The North American Arms Mini-Master is a single-action revolver chambered in .22 Magnum WMR with a 4-inch barrel and a 5-round cylinder. Overall length is 7.88 inches, height is 3.69 inches, width is 1 inch, and weight is 10.8 oz. Frame and finish are stainless steel. Sights are fixed Marble Arms. The grip is a large rubber unit. 
 

Key Specifications 

• Model: Mini-Master 
• Action Type: Single Action Revolver 
• Caliber: .22 Magnum WMR 
• Barrel Length: 4 inches 
• Overall Length: 7.88 inches 
• Height: 3.69 inches 
• Width: 1 inch 
• Capacity: 5 rounds 
• Weight: 10.8 oz 
• Finish: Stainless Steel 
• Frame Material: Steel 
• Sights: Fixed Marble Arms Sights 
   

Features 

The Mini-Master uses the same basic NAA frame as the standard Mini Revolver but adds a longer 4-inch barrel and a larger rubber grip, which together improve accuracy and control compared to the boot-grip 1.125-inch barrel models. At 10.8 oz it is still light enough for pocket carry. .22 WMR develops meaningfully more velocity than .22 LR from a 4-inch barrel, which is part of the reason buyers choose this variant over the standard Mini Revolver. 
 
Fixed Marble Arms sights are more visible than the half-moon sights on smaller NAA revolvers, improving target acquisition at longer distances. Stainless steel resists corrosion for carry in varied conditions. Single-action operation requires manual hammer cocking before each shot, keeping the trigger pull light and consistent.

Mini-Master owners generally split into two groups: those who carry it as a backup or trail gun and those who use it for small game and plinking.

The compact size and light weight get consistent praise from both groups. Stainless construction is appreciated for its durability. Many owners specifically chose the 4-inch barrel and .22 WMR over the shorter .22 LR models for the improved velocity and slightly better accuracy at range.

The .22 WMR debate is the main recurring topic — some owners consider the caliber adequate for its intended role, while others question it for serious self-defense against larger threats. At close range the accuracy is described as satisfactory; at longer distances the short sight radius of even the 4-inch barrel is a limiting factor for some shooters. Trigger pull opinions vary: some find it manageable, others describe it as heavier than expected. Sights draw mixed reviews — the Marble Arms fixed units are better than the mini sights on other NAA models but still leave room for improvement in terms of adjustability. Price-to-value discussions are common, with most owners concluding it is worth the investment for its intended niche.