The NAA Sentinel is a single-action revolver chambered in .22 Mag with a 1.3-inch barrel, 5-round cylinder, silver matte finish, rubber grips, and XS White Dot sights. It ships with a .22 LR cylinder included, so you can swap calibers without buying a separate conversion. 
 

Key Specifications 

• Model: Sentinel 
• Caliber: 22 Mag 
• Action: Single Action 
• Barrel Length: 1.3 inches 
• Capacity: 5 Rounds 
• Finish: Matte Finish 
• Color: Silver 
• Grips: Rubber Grips 
• Sights: XS White Dot 
• Includes: 22LR Cylinder 
   

Detailed Features 

 
The single-action trigger gives a crisp, consistent pull -- important on a sub-2-inch barrel where any slop translates directly to missed shots. The XS White Dot sights are about as good as you can do at this size; they pull the eye to the front sight quickly without requiring a precise sight picture. 
 
The rubber grips absorb some recoil and help with grip on a frame this small. The included .22 LR cylinder is a genuine plus -- .22 Mag is more expensive and harder to find than .22 LR, so having the swap cylinder extends the utility and cuts range costs considerably. 
 

Usage 

 
The Sentinel's 1.3-inch barrel puts it firmly in the pocket backup or last-resort category. It's not a range gun; it's a very small, very light revolver that fits in places a full-size pistol won't. Target practice at the range works better with the .22 LR cylinder. For anything more serious, .22 Mag is the better choice despite the limited 5-round capacity.

Owners of the NAA Sentinel .22 Mag tend to be clear-eyed about what it is and what it isn't. The size is the main draw -- it fits in pockets where almost nothing else does, and the weight barely registers. Most buyers know they're accepting tradeoffs in stopping power and capacity in exchange for that footprint.

The dual-cylinder setup gets consistent praise. Being able to run cheap .22 LR for practice and swap to .22 Mag when it matters is a genuine feature that owners use rather than just mention.

Reliability comes up positively in most reviews. The design is straightforward enough that there isn't much to go wrong.

The small grip is the most common criticism. Extended range sessions with it are uncomfortable for many shooters, and sustained accuracy takes more concentration than with a larger frame. Finish wear over time gets occasional mention, particularly on the silver version.

Stopping power skepticism is present in discussions, especially from shooters comparing it to larger-caliber options. Most who buy it treat it as a supplemental carry piece rather than a primary defensive firearm, which is a reasonable framing given the caliber and capacity.