I bought a new gun yesterday, got me one of these, a tiny single-action, five-shot revolver in .22 LR.
Based on the "what's good in a review" post, I should talk about ergonomics, accuracy, durability, features and ease of assembly/disassembly, so here goes:
Ergonomics: You'd be hard-pressed to find a worse gun, ergonomically. This thing is just too small for almost anyone over the age of 8 to hold comfortably, though the "holster grip" provides a lot more to grab onto than the tiny normal grip.
Accuracy: I haven't shot it yet, but I don't expect it to be great. Not only is the barrel only 1 1/8" long, but it basically has no sights. It does have a pretty good-sized front sight blade, but there is basically no rear sight to align that blade into, just a little notch the hammer falls into.
Durability: It is all stainless steel, so rust won't be an issue. The cylinder walls seem pretty thin, as is the frame, but it's only got to stand up to a .22 LR. I expect it will be durable enough.
Features: The biggest feature is, of course, size. At 4" long by 2" high by 13/16" thick, and with a weight of 4.5 oz, this has got to be one of the smallest factory-produced guns in existence. It's really tiny, and really light. I can ankle-carry it by literally just dropping the folded-up gun in the top of my sock. It's so small that there's an almost endless variety of ways that it can be concealed, including in circumstances where no larger gun would be viable.
The holster grip is another interesting feature. You don't need any kind of holster for this gun, because it has one built in. With the grip folded closed, the trigger is completely encased in hard plastic. The grip has a clip on it which you can easily use for IWB carry, and the gun is small enough to make that very comfortable. Or you can clip it in a pocket as you would a folding knife. Or you could clip it on your belt, OWB. Drawing the gun is a somewhat complicated affair, though, because the hammer spur and various other edges tend to get caught, and then after you have it out, you still have to unfold the gun and then get a grip (not easy with such a tiny gun).
One potential misfeature is the lack of an ejector rod. I expect that it may be necessary to use the cylinder pin to poke spent brass out of the cylinder one chamber at a time.
A feature of all the NAA revolvers is their unique safety system, which is very simple and reliable, and would also theoretically allow fully loaded open carry without a permit. To engage the safety you draw the hammer back slightly and rotate the cylinder so that the hammer is between chambers. You then use the trigger to release the hammer and lower it down into a notch. With the hammer down in the notch between chambers, there is no round under the hammer, so no way the hammer can possibly strike a primer. There's also no round in firing position AND two actions are required to fire the gun (cock the hammer and pull the trigger), which makes a fully-loaded NAA mini revolver unloaded according to the definition in Utah law.
With all of that said, this is obviously not a gun which is a great choice as a self-defense weapon. Besides the disadvantages I've already mentioned, the biggest drawback is the fact that it shoots .22 LR cartridges. I think that the .22 LR still holds the position as the deadliest cartridge in the US, in terms of number of people killed each year, but the fact that it's able to kill doesn't make it a good stopper, especially in a very short-barreled pistol. There have, however, been people who successfully defended themselves with .22s. In fact, last year (or maybe it was 2008) an 80+ year-old man successfully fought off two young assailants with a NAA .22LR mini revolver.
Another issue with using this gun for self-defense is that it's so tiny and toy-like that it may not be very intimidating to an assailant. 95% of firearms self-defense incidents don't involve a shot being fired, so the gun is purely used to intimidate and frighten the bad guy -- but with the NAA mini revolver you'd probably have to shoot him at least once just to convince him the gun is real!
The main reason I bought this gun, though, is because I think it's cute, and it was inexpensive ($209 new at Sportsman's Warehouse). I justified it on the grounds that I need a revolver for teaching CFP courses, but that's a pretty weak justification because it's sufficiently weird and so small that students would find it somewhat challenging to use to demonstrate loading and unloading of a revolver. I'll borrow my dad's .357 for that purpose until I can afford to buy one of my own.
That brings us to disassembly. There's not a lot to it. To load the gun, you press a button on the front of the cylinder pin, which allows you to remove the cylinder pin and then the whole cylinder. With that done, you can clean and maintain the gun. Any further disassembly would probably only be done by a gunsmith. Assembly is a matter of putting the cylinder back in place and re-inserting the pin. This is a little bit tricky because you have to draw the hammer back a little to put the cylinder in. The safest way I've found to load it is to pull the hammer back a little, insert the loaded cylinder into the "between chambers" position with the hammer lined up with the safety notch, then pull the trigger and drop the hammer slowly into the notch, then insert the cylinder pin.
With a little practice you can make sure that the hammer is never lined up with a live round throughout the loading process, but I could see someone who isn't familiar with the gun accidentally letting the hammer fall on a live round during loading. When I let family and friends shoot this gun, I will make sure that I'm always the one that loads it. I will allow others to drop the cylinder, remove the spent brass and load new rounds into the cylinder, but I will always be the one to put the cylinder in the gun.
Bottom line: This gun isn't a practical choice for much of anything, other than maybe as a last-resort concealed carry gun when there's just no way to carry anything bigger. But the low price and the coolness factor of a real, fully-operational firearm that is as tiny as this one have made me want one for years. And now I have one!
Four boxes protect our liberty: soap, ballot, jury and ammo. Use in that order.
Utah CFP Instructor; NRA Certified Instructor for Pistol, Rifle and Self-Defense in the Home; NRA RSO.
I am not a lawyer!