I have 3 NAA mini-revolvers, 2 in .22 Magnum and 1 in .22 LR. I consider all of them to be strictly for close range use, say about 10 feet maximum. As somebody else here said, these are intended as a last resort self defense option, and that's only at conversational distances. I would say killing snakes up to maybe 5 feet using shot cartridges would be an acceptable use for them, too. NAA sells a nice accessory now for about $35, some oversize wood grips that give the gun sort of a western sixgun look and gives the shooter more to hold onto. I have some on one of my .22 Magnums.
For taking small game and general camp and trail use you will be light years ahead to get a small S&W .22 revolver (read: a Kit Gun), a similar Taurus .22 revolver, a Ruger .22 Bearcat, a Ruger .22 Single-Six, or a Ruger .22 Mark III (or earlier versions of their automatic). The Bearcat is an excellent small trail gun that is rugged and compact. If you happen to get an older Ruger single action revolver, as I have, be sure it has either been converted to a transfer bar ignition for safety reasons at the Ruger factory or else you clearly understand how to properly manage an old style single action. That means the older ones must be carried with only 5 rounds in the cylinder and the hammer let down carefully on the empty 6th chamber. The rule is "Pull hammer to half cock, open loading gate, load 1, skip 1, load 4, pull hammer to full cock, then lower it carefully." If you do that correctly you should end with the hammer resting on an empty chamber. Ruger single actions are probably the most rugged trail guns you can carry.