and hunt with an AR-15 platform. What would be a good entry level complete upper preferably with a heavy/varmint barrel in 20" length. From what I have seen on my hunting shows the 223 seems to be the preferred caliber BUT could the 6.8 serve my needs for coyote hunting plus serve the ability as a multi use rifle? If I were to get a 6.8 SPC what other uses could I utilize that particular round for? I would like to get at least my son started hunting this year and because I can hunt coyotes year round I thought maybe this would give myself a more available chance to hunt with him and get him used to being in the woods and learning the ropes so he would be ready for deer season.