Ok so I finally caught the bug and want to do a pretty low budget build. What is the best route to take? I'm looking at a complete lower from Plum Crazy for $119 I just dont what to do for the upper. Should I buy a complete if so from where and what brands (keep in mind low budget)? Would it better and more cost effective to peice one together? I also want to do all new parts not used. The rifle is going to be used mainly just for fun. Thank you for helping a newb.