You have anextraordinarily broad question, so I'm sorry if I don't answer your specific question. You can though take your gun to a licensed gunsmith and have him look at it. Blocked Barrel: If you have somehow gotten something stuck on the inside of the barrel DO NOT SHOOT, that could severely damage the gun or harm you, all you need to do is take a long, thin, and strong rod (fiberglass and steel work great) and gently try to tap the object out the end of the barrel. If that does not work than you might want to use a lubricant like Rem Oil, and repeat the procedure above. MAKE SURE YOU DO NOT USE TO MUCH FORCE, YOU COULD DAMAGE THE GUN. Leaking Reservoir Unfortunately there is little you can do about this. You can try adding more/new grease to the seals of the reservoir but that is usually a temporary fix at the most. You will probably need a new reservoir which you can buy at virtually any airgun store. After that it's your choice whether you let a pro install it or you do it yourself. Damaged Exterior: If you have a synthetic stock gun its much easier just to paint over any scratches, if you have a wooden stock than its a bit harder to do. If the stock of the gun has been chipped there is next to nothing you can do that will cover it up. If the gun has rust on the outside you can use a "Scotch Brite" pad or some steel wool to get it of, or if you like you could use some navel jelly but that could harm the finnish on the gun. Rust: Rust on the inside of your gun is very bad. Usually you need special tools or to go to a gunsmith to get it out. There are ocassions though were you can scrape/dissolve the rust yourself using items such as steel wool, a "Scotch Brite" pad, of some navel jelly. (For information on how to get rust off of the exterior of the gun look at the "Damaged Exterior" section) Broken Part(s): Usually you have to buy a replacement part. For that I would contact the maker of the gun in question and see what is compatible with your gun, then follow the instructions provided to replace that part.
I suggest the you contact an air gun repair shop to have it fixed. Try looking up "Air gun repair" on the web and have them repair it for you.
Do a search on the web for "Air Gun Repair" and locate someone near you to repair the air gun.
It all depends on the model. I suggest the you contact an air gun repair shop to have it fixed. Try looking up "Air gun repair" on the web and have them repair it for you.
Check the web for air gun repair and send it to a shop for repairs.
Do a search online for "Air Gun repair." There are several independent shops that repair older air guns. SEE the Link Below.
I would search the web for "Air gun Repair" and locate a shop near you that can repair it or see the link below for shops that repair air guns.
What model and what symptoms does it have.
Contact an Air Gun repair shop near you. Look on the Web under "Airgun repair or Air Gun Repair" and send it to a location close to you. It very hard to help you if you don't state the name, model and make of the BB gun you took apart.
Search the web for air gun repair or air gun tuning. There are several shops that tune or modify air guns.
Take it to a authorized repair center.
Take it to an authorized repair center
Your best bet is to look on the web for "air gun repair" and find a location to repair it for you.