Do i need to transfer rifle to let girlfriend use it for home defense ?

[Arc Angel]

....... Are there any of the AR's in the $4 - $500 range ?

Yes, here's a few:

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Del-Ton, Mossberg, Anderson, and Windham immediately come to mind. Personally, I lean toward Del-Ton; but I know plenty of shooters who love their Kel-Tec, 'SU ..? ' (whatever) 5.56mm carbines, as well as the collapsible Kel-Tec SUB-2000's. (9mm/40 S&W!) A pistol-caliber Kel-Tec carbine might, also, be worth considering:

https://www.youtube.com/watch?v=z5rr5tfG7b8

My own personal choice in a Kel-Tec? The SU-16D.

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[indyyy]

A pistol-caliber Kel-Tec carbine might, also, be worth considering:

Yes - I remembered couple days ago that the ranges in Indianapolis that allow us to shoot rifles only allow shotguns and rifles that shoot pistol calibers. It seems the Kel Tec Sub 2000 is hard to find.