I am about to start a new build on a Grizzly lower and was looking for some input on my options. I am looking to build a grizzly deer killer for the next season and was thinking of going 6.8spc. I have hunted deer up here in Maine with 5.56 with good results but was thinking of breaking into the 6.8 cartridge hearing all the hooplah about it. Now I would prefurr to go the 20" gov prof route but I am always open to sugestions. What are the options out there? I have looked at some but have yet to find a 20" gov prof upper group. I liked the ones that Bravo Co. was producing but I think there out of stock for a little while. What do you all think? Any technical input would be really apreciated.