The battle rifles that I can think of that fit your price range is a VEPR .308, a cheap FAL pre-panic, or a CETME.
I have not seen an AR10 in the last 8 months worth buying less than $1500.
I told the new me,
"Meet me at the bus station and hold a sign that reads: 'Today is the first day of the rest of your life.'"
But the old me met me with a sign that read: "Welcome back."
Who you are is not a function of where you are. -Off Minor