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.
I would contact Gamo directly for the best answer. See the link below. You do mean "GAMO" not Gamco
What condition is it in? without some sort of description about the condition, it is not possible to answer you. Is it in Poor, Fair, Good, Very Good or Excellent condition.
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.
The major air rifle manufacturers are Gamo, Crosman, Benjamin, UTG, Daisy, RWS, Beeman, Mendoza, King Arms, Hornady, Beeman, Air Arms, Air Venturi, etcetera.
It's usually on the side of the barrel, close to the hinge