First of all advertising is 99% bullsh*t any half decent Aeg can fling a bb 60 meters but doing it accurately is a different matter all together. Dont believe everything you read.
Secondly Firesupport haven't chucked a magic approximate FPS because they are a real airsoft shop. It will be roughly 320fps like all ICS guns bought in the UK. They will chrono it when sold and put the fps on the paperwork.
Thirdly I am out this is going to go nowhere. Are you over 18 , have you got a defence, have you ever actually played airsoft or are you just wasting peoples time?