AR pistol on a budget

#1

Wanting to build an AR pistol to keep with my bug out bag in my truck looking for suggestions on best barrels and BCG on the cheap.

#2

5.56 or another cartridge?

#3

5.56 is my plan on this build

#4

Check midway USA and Palmetto State Armory. I know if you need a lower Tennessee Arms is having a $39.00 shipped lower special.