Actually, it fires a round very similar to our .308 so it works fine as a hunting rifle, or so I've read. Toss a scope on it and you can probably go hunting with it. I got lucky that mine seems to be pretty accurate right out of the box.
As for your AR-15, very nice. I'm looking into investing into this
http://www.budsgunshop.com/catalog/product_info.php/cPath/36_800/products_id/411535182
M4 variant AR-15. I prefer the carbine styles due to the fact, as you can see in the video, that I'm not a very large guy, and the carbines are just more comfortable, at least to me.
I'll have to see if my local gun range will accept firearms from this company. Since I don't have much knowledge in building rifles yet, I figured it's best to buy a complete one first and then learn all the ins and outs of it so that I can build one later and know what the fuck I'm doing.