Air pistols and air rifles are both subject to the same problem. Good, reliable and well-made examples are more expensive than conventional .22's and have less power. Cheap examples are exactly that and do not last. As a winter indoor practice tool they are great, and the good ones are capable of outstanding accuracy with match pellets. After over 50 years as a gunsmith, I learned very early on not to work on them unless they were of very high quality, as every repair just exposed other weaknesses. They are not worth the trouble and soaked up way more time than I could charge for. Most cheap .22 rifles and pistols will out-perform an air gun in all areas; power, accuracy, and reliability.
PS; If you think you are going to solve your sparrow problem with an air pistol, give up now! A good air rifle would be far better. Something like a Sharp Innova or similar pump-up in preference to any break-barrel.
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