Carbine or full length ar-15?

I intend to use it more in the function as a sporting rifle rather than a home defense weapon. I would also like some more range ability and might do some varmint hunting with it. is the full length(20" barrel) the better option for this purpose. If so, what are some good brands. Everyone and their dog makes a... show more I intend to use it more in the function as a sporting rifle rather than a home defense weapon. I would also like some more range ability and might do some varmint hunting with it. is the full length(20" barrel) the better option for this purpose. If so, what are some good brands. Everyone and their dog makes a m4 profile weapon, but who makes some quality 20" m16a2 profile models.
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