I bought an SRC M4 and when i got it it never came with a battery or with any O rings and i've e-mailed them and they said to send it back so i did so with everything it came with and that was a month ago and still they refuse to reply. I think the ###### that runs the sight should not be allowed to sell these guns if he's just going to steal from his customers the first chance he gets.   Do not buy from www.juststealguns.co.uk