The receivers are different sizes. The mag well is larger to accomodate the longer rounds and mags. So, you would need an AR10 lower or other .308 AR lower (Since AR-10 is technically only the Armalite version).
From what I understand an AR-10 is just an AR-15 in .308. If I'm wrong just let me know but could you use any complete lower to build one?
negative ... AR10 and AR15 are two separate platforms ... similar in appearance but different in specs. Also bear in mind that their are 2 distinct platforms within the AR10 series ... Armalite and DPMS ... they are NOT compatible
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