I was wondering if anyone had specific sites they like to go to for parts shopping. I am particularly looking for Ar-10 barrels, but i'll need more upper parts eventually. Thanks for the input

I have two that are in the DPMS format and I bought Rainier arms barrels because I thought the price / performance was great and they both shoot wonderfully.   They have AR10 formatted barrels as well.  They also sell Noveske but you could  shop around for that.

 

Here's an example:

 

http://www.rainierarms.com/rainier-arms-matchtm-308-barrel-22

 

I have a shadow ops weaponry NiBx BCG in one of them and a phosphate DPMS BCG in the other.  The Shadow Ops Weaponry one is tough to beat on price but the DPMS ones may have come down in price.  When I bought my DPMS BCG it was really hard to find and expensive.  

 

Overall Rainier Arms has a lot of stuff for either format you outline, rails, receivers, barrels, gas blocks what have you.  There are other sources as well so check the prices before buying but the barrels I find to be quite good.  

I just bought a Black Hole Weaponry, many options to order the barrel how you want it, mine is a 18" 5.56 1/8 Twist, Black Shot Peened, 416R Stainless Steel, 3 Polygonal Rifling, Target Crown. I paid less than $220 on sale.

http://www.blackholeweaponry.com

i was looking at black hole weaponry, also JSE Surplus seemed to have some reasonable prices but limited selection. The more I look into it the more I think a complete upper is looking better and better. Different animal then the ar-15 compatibility wise. I was under the impression that PA-10 lowers were DPMS format, now im hoping i ordered the correct lower kit

Mega Arms also makes some. 16", 18" and 20" nitrided 416 stainless. The 20" is a rifle length gas while the other two are midlength. They're all guaranteed to be sub-MOA with match ammo too.

found a good deal on DPMS hunter lite 20" target crowned barrel......all parts have been ordered, thanks for your input guys, appreciated