Hi my name is anthony. I am a police Firearms and Patrol Rifle Instructor. After a neck injury I found that shooting my .30-06 with a 165 grain load, was to much on my shoulder and neck and although I can sight it in, and have taken a deer with it, I found that it was not fun to shoot anymore as it causes residual pain. Loving my AR-15 in the military and the patrol issued ones, I started doing research on the 6.8 SPC. Figuring that the recoil would be less utilizing the the buffer spring. My problems is that there is to much infor or varying opinions on what to get. Should I go with the basic 1:10 twist and get a reasonably priced upper from stag arms with a spec II or should I go with a 1:11 twist from a company like Cardinal Armory, who I have heard had problems with their chrome linings. ? any information would be great. I also need to know about what factory loads to buy at first. I will see about loading my own later.