Quoted:
Hi all,

This is my first post and I'd first like to thank you all for the wealth of knowledge that is on this site.  Made it really easy to get through my first build (.223, single stage, 16").

I am starting my second build soon and want to really deck this thing out.  So far, I have an Aero Precision lower, and I'd like some recommendations on build #2
http://aeroprecisionusa.com/shop/ar15-stripped-lower-receiver-with-cerakote

My goals:
-long range
-large caliper
-sniper rifle style

Questions:
How do i match caliber to barrel for best accuracy?
What is the largest caliber i can go with a standard lower and still use a magazine? (The more recoil the better)
Do i need a BCG specific to that caliber?
How much does the stock affect accuracy and which style should i lean towards?
I'd assume 2-stage trigger right?
Which type of optic?

Thanks is advance!