As others have said, if by "AR" you mean a gun derived from the AR-15, they are all restricted by definition.
However if by "AR" you mean any true "assault rifle" then there are a variety that are non restricted and many threads about this topic:
-- Swiss Arms Classic Green / PE90
-- XCR
-- ACR
-- SL8
-- Tavor
... bunch more, but for the most part you can't trade parts between the AR-15 platform and any of the above, except in a few cases things like magazines. Variants of Swiss Arms, SL8, and Tavor are actually used by several Western militaries.
Technically there are other AR lines that are non-restricted, I don't think guns derived from AR-10 are restricted. It's specifically AR-15. Is an AR-10 an AR? Most people mean AR-15 when they say AR.