[Eeyore]

Get a WE closed bolt system and a NPAS for it. Remember that gbbr's are not something you game and throw in the corner till nest time like an AEG. Gbbr's need love, and maintainance. Any gbbr you guy will eventually break down, you will have to replace parts periodically as they wear out. Make sure you get a brand that parts are common for. No sense buying a new shiny wall hanger cause you can't get it up.

WE is the king of gbbr innovation right now, no other company has producted so many differant models as WE.