How about this upper?

[reelredneck1]

Thanks to all the help I received on my last thread, I'm half way to my first AR. Thanks again guys! Surprisingly I was able to throw it all together in about 15 minutes without a problem (I'll attach some pics). So here is what I'm thinking for an upper http://www.spikestactical.com/z/index.php?main_page=product_info&cPath=63_134&products_id=449. Any thoughts? Probably gonna order it this weekend unless I find anything I like better.

 

[unwise11]

Grab 'er up, and make sure to throw some tacticool stuff on there. too much rail-estate.

 

[reelredneck1]

Now I see that that spike's has this same receiver/rail setup, but it has a carbine length gas system with a low profile gas block instead of the mid length with the front sight. I like the carbine setup better as I want to mount some glass and flip up irons. I have heard that the mid length does better on 16 in barrels.Does it really matter?
here is the link http://www.spikestactical.com/z/index.php?main_page=product_info&cPath=63_134&products_id=477