The NAA MiniMaster is a compact .22 LR revolver with stainless steel construction and a convertible cylinder for .22 Magnum. At 10.8 oz and 7.88 inches overall, it's about as small as a functional revolver gets. 
 

Key Specifications 

• SKU: 3457703 
• UPC: 744253000553 
• Brand: North American Arms (NAA) 
• Model Name: Mini-Master 
• Caliber: .22 LR / .22 Magnum 
• Action Type: Single Action (SAO) 
• Capacity: 5 rounds 
• Barrel Length: 4 inches 
• Overall Length: 7.88 inches 
• Weight: 10.8 oz. 
• Grip Material: Finger Grooved Black Rubber 
• Finish: Stainless Steel 
• Condition: New in Box 
   

Detailed Features 

 
The stainless steel finish resists corrosion well. The heavy vent barrel aids heat dissipation during sustained firing and adds a bit of weight forward for steadier aim. Finger grooved rubber grips give a secure hold for a gun this size. Marble Arms fixed sights improve target acquisition beyond what most pocket guns offer. The safety cylinder prevents accidental discharge when the hammer is lowered between cartridges.

The NAA MiniMaster draws a consistent mix of practical appreciation and honest caveats from owners.

The compact size and light weight are the main draws. Most people who carry it do so as a backup, and the stainless construction gets credit for holding up in varied conditions.

Being able to run both .22 LR and .22 WMR with a cylinder swap comes up a lot as a selling point for anyone who wants flexibility. Accuracy surprises people given the size — the 4-inch barrel helps more than you'd expect.

The grip is where it gets complicated. For a gun this small, the rubber finger grooves work reasonably well, but extended sessions can get uncomfortable, and shooters with larger hands feel it most. Trigger pull on the single-action is heavier than expected for some first-time owners, though it smooths out with use.

Overall the tone in discussions is positive. People are realistic about what it is — a small-caliber backup revolver — and within that context it tends to deliver.