Advice on buying a AR-15?

I want a good gun, for target and some hunting...but basiclly i like to shot and want to buy a ar platform gun. I know a piston upper is cleaner and more reliable but is that reliability worth the extra money when im just shooting for fun? and id like opinions on which AR type guns u recommend im looking at Robarms... show more I want a good gun, for target and some hunting...but basiclly i like to shot and want to buy a ar platform gun. I know a piston upper is cleaner and more reliable but is that reliability worth the extra money when im just shooting for fun? and id like opinions on which AR type guns u recommend im looking at Robarms XCR now and a few others. Also i would really like to get a 6.8 caliber...
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