changing from ar-15 to ar-10

[LouBoyd]

Originally Posted by Colohunter

You can get different calibers for the ar-15, but they have to fit within the magazine restraints of the ar-15.

There are lots of caliber selctions for AR-10s (and clones) too. I have DPMS clones in 243 Win, 260 Rem, 6.5 Creedmoor, 308 Win , 338 Federal, and 300 SAUM. (all factory offerings).
Many more are available as custom or semi- custom offerings. Basically anything based on the 308 or 300 SAUM case is available.