Yeah, as much as video game roles of playing a sniper make a person interested in it, i wouldn't suggest it as being a sniper in Airsoft is completely different. You can't shoot a bigilion miles. you can be out gunned and ranged by anyone with an aeg shooting full auto.
So, just as everyone had said, you need to save up experiment with probably a DMR style. build up a solid DMR AEG and you can typically experiment a role as a sniper.
VFC HK416 Custom
Custom Bowie Tactical x SAI Glock 17 (TM Base),
Custom SAI BLU Glock Build (Timberwolf Base)
Custom Zev Noveske Shooting Team Glock 34
Custom Zev Dragonfly G17 (Project) (In progress)