1/4" groups at 100yrds. And it's an AR-15. NO full auto parts. It's my varment gun. 20" 1:9 twist Bull barrel. Stainless. Cryo accurized. Plans include a single stage JP 4lbs trigger, low mass hammer, Ti firing pin, and a better scope.
What kind of Varments? Sounds like you are planning on giving them a closed casket funeral.