I have been writing a series in AirGunner looking at rifles for £500.
The best bang for your buck by miles is a nice second hand HW100 or HW101. Get yourself a single shot adaptor to go with it and it's a brilliant hft gun.
Somehow I made TEAM ENGLAND 2012 and 2013
Illiterate writer for AirGunner
The real Kung Foo Panda.