Bison Armory is going to start making rifles in the standard 223/5.56 AR chambering. Previously they made them in 6.8 SPC and .308/7.62 calibers. http://bisonarmory.com/16-223-recon-rifle/ I have a 6.8 upper from them. Looking at getting a 2nd 6.8 from them, maybe a compete gun. The 223 looks to be a nice rifle. Now for the "over priced" "too new" "I stick with...." comments to follow Wanna kill these ads? We can help!