Hello, my little brother is getting a http://www.airsoftatlanta.com/JG-M4-S-System-AEG-Desert-Tan-p/65014b.htm He wants to upgrade it external and internally. I could do the upgrades but i don't know what to get because i mainly focus with snipers and hangout on the airsoft sniper forum. I don't like to buy parts that i know ill replace so can someone give me some ideas on products of what to get for his gun. He'll get more money later but for now can you make around 200-250. Thanks PS- He's got his little heart set on getting some sort of red dot sight, so recommending a nice one would be appreciated.