Actually, they are fairly accurate little guns, but difficult to shoot accurately. There is a major difference in the sentiment. People find them hard to shoot well because of the tiny birds head grip (which is just about right for a 7 year old, FYI), rudimentary sights, extremely short sight radius, and heavy trigger. All of these facets lead to the gun being difficult to shoot well if you are going for bullseye marksmanship.
Even if some were corrected, it still would not be a bullseye gun, but it is fairly accurate. I actually put a red dot scope (Aimpoint Micro T-1) on my NAA mini revolver with a 1/1/8" barrel and was able to hit a human IPSC silhouette at 50 yards more than 50% of the time.
Here is the thread where I discussed adding the optic and the initial testing at 7 yards.
http://www.thehighroad.org/showthread.php?t=387345&highlight=naa+mini+micro
At 15 feet, you can point shoot it and hit a silhouette very quickly.
No trigger guard and too short of a barrel to be worth much.
It is a single action only revolver. You never holster or carry a SAO revolver in the cocked position. So, a trigger guard is not needed. The hammer rests between cartridges in special notches in the cylinder. So there is no real chance of it going off if dropped or the trigger is depressed.
As for the short barrel, depending on the ammo from with mine, we got velocities of between 570 and 640 fps using 40 gr. ammo
http://www.naaminis.com/pix/lr.jpg
You can get more velocity out of it with 29 gr. ammo...
http://www.naaminis.com/lrvelnew.html
With all that said, these are not what I would consider good primary self defense guns. They are excellent hideout guns, guns that are good to induce a person to "get off me."
Even with their low velocity, they have proven suprisingly lethal. However, I would not count on one for making a quick biological stop.
For what the gun is designed, short range, it is very good. They are well made guns.
And no, the Aimpoint did not stay on mine. That was for fun only. The Aimpoint is now on a Marlin 1895 .45-70 and the NAA Mini Revolver is in a holster in my back pocket.