ok same as whats been said, plus
you do want an air bottle, co2 will work fine on a macanical like a tippman but will still damage o-rings and if he upgrades marker at any time to an electonic marker he is better off with air.
the flat line barrel is good fun as it does increse your range but as the lining of the barrel is not smooth then stronger paint/lower firing pressure may be needed so you dont start shooting soup.
after that its all just a matter of buying what you want realy
finaly have fun!!
you do want an air bottle, co2 will work fine on a macanical like a tippman but will still damage o-rings and if he upgrades marker at any time to an electonic marker he is better off with air.
the flat line barrel is good fun as it does increse your range but as the lining of the barrel is not smooth then stronger paint/lower firing pressure may be needed so you dont start shooting soup.
after that its all just a matter of buying what you want realy
finaly have fun!!