Good source for a complete 6mm ARC upper today that won't break the bank?

[Sid Post]

I am looking to get a complete 6mm ARC upper in an 18" format. I need to humanely kill dogs killing livestock, coyotes, and pasture detroying feral hogs. 5.56 isn't enough payload for longer range shots, though I'm not talking about 600-yard kill shots either. What is recommended for acceptable accuracy that is available today or in the near future?

For clarification, I want to stay in the AR-15 format and could do a SBR option, however, I want the velocity and payload to smack hard with modern bullets. 18"~20" seems to be the sweet spot for the 6mm ARC with payloads in the ~90gr range, and has the legs to reach way out there if needed with the right bullet.

For reasons I don't understand, complete uppers, or complete rifles, seem to be pretty scarce for reasons unknown right now. I'm not a gun plumber right now, so building my own isn't an attractive option today.

TIA,
Sid

 

[RFutch]

Grendel Hunter make good stuff for the money.

 

[rlsmith1]

They are hard to find because everyone loves what they have! I'd recommend a JP bolt and Craddock Precision barrel and simply drop that in your current upper. The Craddock RTR barrels are great and their Bartlien barrels are top shelf.

KAK uppers are reasonable and I've had good luck with their 556 barrels so they might be worth a look too

ETA: on KAK I'd go with a stainless barrel from them

 

[Rob01]

Grendel Hunter complete uppers are affordable and accurate. I have a 22” version and like it a lot.