Between my youngest son (going on fifty this year) and I we have three Gamo Swarm rifles, he has a Fusion gen one and a Maxim gen two, I have the wood stocked Bone Collector model with the gen one 10-X magazine, mine is the newest of the lot, my son has had his for about a year, mine is about six months old, we have a back yard range and shoot several times a week and at least one day on weekends.
We also have several other brand of break barrels, one PCP rifle, and my vintage Sheridan Blue Streak, all are very accurate, that said, accuracy is a subjective term, one that has almost as many interpretations as there are shooters, I'm no expert but in my humble opinion any break barrel air rifle capable of shooting within a 1-1/4 inch circle at 40 yds. consistently is minute of squirrel accurate, and our Gamo Swarm rifles can do that easily, my son's $300.00 Xsisco PCP from Flying Dragon Air Guns gives consistent one hole groups 75 yds. and opens up a bit at a hundred.
Then, (again in my opinion) it's not all a guns fault for being inaccurate, some guns are lemons but many have potential that's never reached because their owners don't go far enough to develop that potential, pellets are a major factor in accuracy, most guns have favorites, the skill and habits of the shooter have a lot to do with accuracy, the environment in which the gun is being shot can affect it's accuracy, and then there's expectations, some shooters just expect more out of a gun than it has the capability to achieve, then there's care, I know some shooters (air gunners and powder burners alike) who don't regularly clean or lube their guns or even store them properly, one fellow one time was cursing his year old Benjamin brake barrel .177 cal. air rifle at the range claiming it to be the biggest POS gun on the market because he couldn't hit a gallon water jug at 25 yds. with it, I asked to look at it while he was ranting and found that the stock screws were about ready to fall out and his rear scope ring was lose, he had never checked the gun over or cleaned it since he bought it, so it's not always the guns fault if it suffers from accuracy or function problems.
You can get a bad gun from any maker, but so far all our Gamo air rifles have been keepers.
As an aside, with any rotary fed air gun magazine you have to insure that the pellets you are using work well with your magazine, some pellets are just a hair too fat, others are a little too long, if you have a problem loading or turning your magazine when loading it's a pretty good indicator that your magazine doesn't like that pellet type and that you may experience feeding problems.
Gamo triggers are not always the best out of the box, but a simple two minute fix can work wonders with your trigger, John over at Air gun Detectives.com sells a special trigger screw that lets you adjust your Gamo SAT or CAT trigger down to light, ,smooth, and crisp without taking it apart, you simply take a medium phillips head screw out of the trigger and replace it with John's allen head machine screw and a drop of lock tight (allen wrench is supplied with the screw), so for $10.00 and two minutes work you get an expert trigger job on your new Gamo rifle, and you did it yourself.
