Get a GR3T trigger for it. It is considered the very best trigger available for Gamo.
See the link below
I would contact Gamo directly for the best answer. See the link below. You do mean "GAMO" not Gamco
You can purchase a Gamo air rifle at your local Walmart retail store. You can also purchase one online from the Amazon website and have it shipped directly to your house.
The Gamo Silent Cat fires .177 caliber Pellets not BB's.
I suggest you contact Gamo Customer Service with this question. See the link below
Gamo is a manufacturer and retailer of air rifles. They also make and sell a variety of air rifle ammunition and accessories, such as targets and magazines.
Start with the Gamo home page "Gamousa" customer service contact. Or see the link below for shops that repair air rifles.
If you disassembled it you may want to contact Gamo directly and see if they can help you with a diagram. Call 954-581-5822 Gamo Customer Service. Unlike Crosman who post schematics for all their guns and rifles, Gamo and Daisy does not. Your next best shot is to check the web for an "Air gun repair" shop and send it to them for assembly and repair.
Currently Gamo makes an "Air Shotgun" that fires both shot or a .22 cal Pellet. It's the Viper Shadow Express.
You will have to contact the maker to find out.
Your best bet is to look on the web for "air gun repair" and find a location to repair it for you.
Gamo never made a Sniper model rifle. It depends on the model, each one is different. You need to locate the model number and ask your question again.
The major air rifle manufacturers are Gamo, Crosman, Benjamin, UTG, Daisy, RWS, Beeman, Mendoza, King Arms, Hornady, Beeman, Air Arms, Air Venturi, etcetera.