Quoted:
Come on. Everybody blows their nose in Kleenex and nobody calls other brands just facial tissue. This AR10 thing only lives on this forum because lawyers got involved.
This is true with facial tissue but not .308 AR's. There is the Armalite pattern and the Stoner/Knight's/DPMS pattern. Mags are the biggest difference. They do not swap. Armalite uses a mag similar in dimension to M1A1/M14 and the DPMS uses the Stoner/SR25 pattern mags(like Magpul PMagLR).
As CabinetMan pointed out, most parts do not swap either. Different parts, receiver sizes, etc.
Great link to illustrate this:
http://308ar.com/compatibility.htm
DPMS/KAC pattern for the win, or, build up a MEGA MATEN!
To the OP, if you see one and want to buy one, you should as parts, guns and ammo are already getting harder and harder to come by here in the great Northwest.