Ar 15 which rifle... 223 cal. or 6.8....?

I see so many ar 15 dealers now adays i cant choose which ones i want i am looking for one basicly a coyote rifle i was looking into doublestar and rock river arms thats my choices id like to keep it under a grand atleast the 6.8 is a more powerful round but yet its no where near the ammo variety as the 223. Which... show more I see so many ar 15 dealers now adays i cant choose which ones i want i am looking for one basicly a coyote rifle i was looking into doublestar and rock river arms thats my choices id like to keep it under a grand atleast the 6.8 is a more powerful round but yet its no where near the ammo variety as the 223. Which one would be good for me.
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