No one seems to have pointed out that if he uses nitrogen to fill his rifle he will be committing an offence as only air and CO2 are permitted, all other gasses I believe are excluded.
No offence committed because no law has been broken.
You can spend thousands and still miss a barn door or spend just enough and enjoy yourself. If you haven't got the talent to start with a million pound won't fix it. Whippet, Russell, a few bang sticks and a flat cap. http://www.smart-tech1st.co.uk