Re: ??? about the 6.8 spc round
+1 to what DPB said on all accounts. As far as I know, you can only get the .243 on a rifle that is built in the AR-10 platform. From what I have heard and read, they are not all made to one particular spec, so some of the parts will not be interchangeable the way they are in the AR. Since you sounded like you only wanted to change out the upper, then that would probably make this caliber a no go. If I can help you in any way, please let me know. I just want people to be educated and know what they're getting into, in terms of bullet choices, brass choices, cost, and what it all sort of equates to in terms of ballistics. Best of luck to ya.
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