7.62x39 upper

[Daniel_187]

i have been toying with the though of a 7.62x39 upper for hunting, because it would be cheaper then buying a new deer rifle. I have met a few guy while out hunting running them. but did not stick around long to get any info. can I use my 5.56 lower with no mods? will it bolt right up? who's a good company that makes them? What kind of range am I look at too. ammo too?

Thanks