So I have a guy that wants me to build him an AR, but in a 243. Now, my question is, other than the bolt and barrel, is there a difference in any other AR? I know the lower is going to be lower to accomodate the larger magazine, but is there any other difference? Is the bolt carrier bigger? Is the recoil system different?
I can never find just an upper, and I have never seen one in person to observe it, so thought you guys might be able to shed some insight on the issue... Thanks.