BSA Scorpion T-10 Air Riffle

This is a used BSA Scorpion T-10 Air Riffle. I personally don’t know a lot about guns, this was owned by my father in law. It has not been used for about 5 years. It looks in good condition. Comes in a fabric bag and also an air compression cylinder and 5 packs of lead pellets, apart from one they all look full. There is also a separate sight chucked in. I wasn’t 100% sure what the calibre is, I listed it as 177 as that’s what I found it as online.