Hey guys,

I'm going to be picking up an Adams Arms 11.5" P2 5.56 upper here soon, but I'd like to piece together my own lower.
I'm not 21 yet, so I'm going to need to finish it off an 80%. I generally like to just buy full finished rifles, but in this case I don't have a choice.

Anyone got suggestions for which parts I should get for the lower? What's the "Best" 80% lower out there? What's a decent trigger that's better than a stock trigger but won't break the bank? (CMC perhaps)
What's a good recoil spring? Should I go with a slightly upgraded option? Or will that maybe cause cycling issues and I should just go with a stock one?

Apart from that I know i'll be getting an SB Tactical brace and a Magpul K2 grip.

Thank you!