hi, i am new to gas airsoft guns and i was going to get this gun. first off, how long do you fill the mag for before it is full? second, green gas or propane? i play in my back yard with a ton of friends (we live in a small town and have huge private properties) so fps does not matter because we agreed that any semi only or sniper rifles can shoot as hot as they want and they know how much fps this has. also, do you recommend the ra tech outer and inner barrel for this gun (here is the link:
http://en.ratech.com.tw/product/html...detail_017.php ) and finally, what gram bb is recommended for best range? (i am not using .4's, they sound like they mess with your hop up)