Upper/Lower and barrel combo

[BamaHammer]

Thinking about going with the precision firearms Mod 2 forged lower and the BCM upper

https://secure.wf-api.com/www.precisionf...lower.html

https://secure.wf-api.com/www.precisionf...op-m4.html

I'm thinking of an 18" barrel... maybe lilja?

The plan for the rifle is deer/pig gun. I'd like to be confident with it out to 500-600 yards

Any thoughts or other suggestions?