The ar-10 lower allows for larger caliber uppers that the the ar-15 lower cannot, not just the .308. You can get uppers or whole ar-10 rifles in 243 Win, 260Rem, 7mm-08, 284Win, 308Win "Match", 35Rem, 300Savage, 257Roberts, 358Win. 270WSM, 7mmWSM, 300WSM, 325WSM, 338WSM, & 450Marlin.
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