The NAA Mini Antivenom is a single-action revolver chambered in .22 WMR (.22 Magnum) with a 5-round cylinder and 1.8-inch barrel. Overall length is 4.63 inches and weight is 6.2 oz. The finish is stainless with a standard snake skin grip. 
 

Key Specifications 

• Manufacturer: North American Arms (NAA) 
• Model: Mini Antivenom 
• Caliber: .22 WMR (.22 Magnum) 
• Barrel Length: 1.8 inches 
• Capacity: 5-round cylinder 
• Weight: 6.2 oz (approximately 0.39 lbs) 
• Overall Length: 4.63 inches 
• Finish: Stainless with Standard Snake Grip 
• Action Type: Single Action 
   

Detailed Features 

At 6.2 oz and 4.63 inches, the Mini Antivenom fits in a pocket or purse without adding noticeable bulk. The stainless steel construction handles weather exposure well. Half-moon sights allow for quick target acquisition at close range. Single-action operation means manually cocking the hammer before each shot, which is standard on this platform. The .22 WMR cartridge delivers more velocity than .22 LR from the 1.8-inch barrel, though terminal performance at this barrel length is modest compared to larger calibers.

The NAA Mini Antivenom is a niche product with a clearly defined use case: deep-concealment backup carry or pest control where size is the primary constraint. Owners who buy it understanding those parameters tend to be satisfied. The compact dimensions, stainless construction, and snake skin grip aesthetic consistently draw positive remarks.

The .22 WMR caliber from a 1.8-inch barrel generates the most substantive discussion. Most experienced shooters acknowledge that stopping power is limited compared to centerfire defensive calibers, and the consensus is that it works best as a last-resort backup rather than a primary carry gun. Accuracy at longer distances is limited by the short barrel. This is a close-range tool.

The small grip size is comfortable for smaller hands but can be challenging for larger ones during extended shooting sessions. Reliability is generally rated positively when the gun is clean and well-maintained, which NAA owners treat as a standard expectation.

Tiny and light enough for gym shorts, yet it ran flawlessly and fits my smaller hands just right.