Start with the Gamo home page "Gamousa" customer service contact. Or see the link below for shops that repair air rifles.
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.
Gamo makes a dozen different rifles and pistol's. I find then to be of Very Good quality. I personally prefer the Nitro piston models over Spring. The new Dynamax (PCP) looks promising but expensive.
The Gamo Silent Cat fires .177 caliber Pellets not BB's.
If it's a C02 powered system then yes you can dry fire it. If it's a spring powered system the NO do not dry fire it. It will damage the system.
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.
I would contact Gamo directly for the best answer. See the link below. You do mean "GAMO" not Gamco
You will have to contact the maker to find out.
Get a GR3T trigger for it. It is considered the very best trigger available for Gamo. See the link below
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.
Best left to a trained person.
The major air rifle manufacturers are Gamo, Crosman, Benjamin, UTG, Daisy, RWS, Beeman, Mendoza, King Arms, Hornady, Beeman, Air Arms, Air Venturi, etcetera.