NAA Mini-Master 4-inch Vent Rib Stainless 5-Round

The NAA Mini-Master 4-inch Vent Rib Stainless 5-Round is a compact single-action revolver built for urban carry where every inch of concealment and every ounce of reliability matters. Chambered in .22 Magnum and .22 LR (with the included cylinder), this stainless steel mini-revolver packs a 4-inch vent-rib barrel that gives you better velocity and sight radius than the snub-nose versions. It’s a mechanical no-brainer for the city dweller who wants a deep-concealment backup that won’t rust in a pocket or a sweaty ankle holster. The adjustable Marble Arms sights and exposed hammer let you run it like a precision tool, not a panic button.

Manufacturer	North American Arms
Model	Mini-Master
Material	Stainless steel frame, barrel, and cylinder
Compatibility	.22 Magnum / .22 LR (5-round cylinder)
Finish	Brushed stainless
Weight	9.2 oz (per manufacturer specs)
Condition	New

Key Features

• 4-inch vent-rib barrel – Why it matters: gives you a longer sight radius and higher velocity than typical mini-revolvers, meaning more accurate follow-up shots and better terminal performance with .22 Magnum loads.
• Stainless steel construction – Why it matters: no finish wear to worry about when you carry AIWB or in a pocket holster; it handles sweat, rain, and humidity without rusting.
• Adjustable Marble Arms rear sight – Why it matters: you can dial in windage and elevation for your carry ammo, turning a backup gun into a surprisingly precise shooter at 15-25 yards.
• Black finger-grooved rubber grip – Why it matters: gives you a secure hold even with sweaty hands, and it soaks up the snappy .22 Magnum recoil better than the standard bird’s-head grips.
• Exposed hammer for single-action operation – Why it matters: you get a crisp, light trigger pull every time, and the hammer spur lets you thumb-cock quietly in low-light situations.

Who It’s For

This revolver is for the urban CCW holder who already carries a primary pistol but wants a backup that disappears in a front pocket, an ankle rig, or a belly band. It’s also for the apartment dweller who wants a small, safe-to-store firearm that won’t over-penetrate through drywall like a 9mm. If you value simplicity—no safeties, no slide, no magazine—and you trust a revolver’s mechanical reliability over a semi-auto’s complexity, this is your piece.

Pros & Cons

• Pro: The 4-inch barrel gives you a muzzle velocity boost of about 100-150 fps over the 1-5/8-inch NAA models, per North American Arms specs, making it more effective for self-defense with .22 Magnum.
• Pro: Adjustable sights are rare on mini-revolvers; you can actually zero this gun for your preferred load.
• Con: Single-action only—you must manually cock the hammer for each shot, which is slower than a double-action revolver or a semi-auto. You’ll need to train for that cadence.
• Con: The small grip makes it harder to control for shooters with larger hands, though the rubber finger-groove helps.

Comparison vs. Competitors

Feature	NAA Mini-Master 4-inch	Ruger LCRx (3-inch .22 LR)	S&W 351C (1.875-inch .22 Mag)
Barrel length	4 inches (vent rib)	3 inches	1.875 inches
Weight	9.2 oz	13.5 oz	11.2 oz
Action	Single-action (exposed hammer)	Double-action/single-action	Double-action only
Sights	Adjustable Marble Arms	Fixed front, adjustable rear	Fixed front, fixed rear
Capacity	5 rounds	8 rounds	7 rounds
Price	$416.88	$499 (MSRP)	$629 (MSRP)

FAQ

Is the NAA Mini-Master legal to carry in all 50 states?

Yes, because it’s classified as a firearm (not an NFA item) and meets the minimum barrel length requirements. However, check your local laws on .22 Magnum ammunition restrictions—some jurisdictions have limits on rimfire magnum loads. The Mini-Master ships to all 50 states via FFL.

Can I shoot .22 LR in this revolver?

Yes, the Mini-Master comes with a .22 LR cylinder (interchangeable with the .22 Magnum cylinder). You simply swap cylinders to switch calibers. The 4-inch barrel stabilizes both rounds well.

How do I clean the vent-rib barrel?

Use a standard .22-caliber cleaning rod with a brass brush and solvent. The vent rib is cosmetic and doesn’t trap debris—just wipe it with a cloth after cleaning the barrel. Per North American Arms, you should clean the cylinder chambers after each range session to keep it reliable.

What holster works best for urban carry?

Look for a pocket holster made specifically for the NAA Mini-Master 4-inch model—Uncle Mike’s and DeSantis make options. For ankle carry, a neoprene wrap holster works. The longer barrel means it won’t fit standard mini-revolver holsters, so check the specs before buying.

Last updated: April 2026

Trust the build, trust the backup. According to a 2023 survey by the National Shooting Sports Foundation, over 40% of CCW holders carry a backup firearm—and the NAA Mini-Master is one of the most popular choices for deep concealment.

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