Help me build an AR-15
"I want to build an AR-15, in .223 wylde, 6.5 grendle, .50 beowulf. Two lowers, three uppers. I have about $3500 to build. Uses: .223: varmint and target practice. 6.5 grendle: light game and varmint at distance. .50 beowulf: any thing under 200 yrds."
My first suggestion if you know nothing about the AR-15 is to SLOW DOWN!!!
Buy or build JUST ONE upper and lower for now.
Being your first AR-15, my recommendation is to always start with the .223. Once you have more experience then move on to additional uppers and lowers.
This way you don't end up being unhappy with all of your uppers and lowers.