Welcome to the forums!
To edgecrusher's point, the semantics of AR10 vs. 308 AR is important when you're trying to set up your build. There are two primary or somewhat standard versions, DPMS/SR-25 type and Armalite which is the AR10. There are other outlying brands with proprietary formats, but aftermarket parts for those brands either rare, custom made, or nonexistent. Armalite and DPMS both make 308 ARs, but only Armalite makes an AR10.
Knowing the difference will save you a lot of trouble, trust me.