Ok i think i have every piece i need!

PSA Complete Lower http://palmettostatearmory.com/index.php/catalog/product/view/id/1213/category/4284/ ($129)
Anderson complete upper http://www.primaryarms.com/Anderson_Manufacturing_A3_AR_15_Flat_Top_Upper_Rec_p/ar15-a3-upper.htm
at3 tactical rail 15.75inches http://www.at3tactical.com/products/at3-tactical-extra-long-15-75-free-float-quad-rail-handguard
PSA 16inch barrel http://palmettostatearmory.com/index.php/psa-16-m4a1-5-56-nato-1-7-barrel.html ($99)
Ares armor bcg http://aresarmor.com/store/Item/nickel_boron_bolt_carrier_group
bcm low profile gas block http://www.bravocompanyusa.com/BCM-Low-Profile-Gas-Block-p/bcm-lgb-750.htm
Daniel Defense gas tube https://www.primaryarms.com/Daniel_Defense_Mid_Length_Gas_Tube_Assembly_p/04-013-09401.htm
DPMS flash hider http://www.midwayusa.com/product/343064/dpms-flash-hider-a2-1-2-28-thread-ar-15-matte
Mags: Magpul pmags
Sights: Magpul mbus
Ammo: Federal Premium 223
I do believe that is it! And if its not , please let me know what im missing!

Charging handle?

Can I make a suggestion? I would buy the PSA blemished Upper receiver and just get a upper parts kit. The only tools you would need is a punch and hammer, It's nice having a matching upper and lower. Also I see you selected a Mid length gas tube with a carbine length barrel. One more thing...I noticed the handguard you selected is VERY heavy compared to most others, I would recommend saving a few more $ and getting something like this Midwest Industries Gen 2 free float or their Lightweight Mlok. Just my opinion but either way good luck and enjoy!

http://www.midwestindustriesinc.com/index.cfm?fuseaction=category.display&category_ID=450

http://www.midwestindustriesinc.com/index.cfm?fuseaction=category.display&category_ID=1266

Alright the only reason i havent put a psa upper is becuase its been out of stock. But im most likely going to get the psa upper. http://palmettostatearmory.com/index.php/complete-upper-receiver.html
lol the gas tube i didnt even see that but ill get this one http://www.primaryarms.com/Daniel_Defense_Carbine_Length_Gas_Tube_Assemb_p/04-013-01009.htm
As for thee rail i decided to get the samson evolution in 15 inch. http://www.midwayusa.com/product/2852128132/samson-evolution-series-customizable-free-float-handguard-ar-15-aluminum-matte

I would suggest trying to find as many parts in stock at one place as possible. You're going to add $100 in just shipping fees ordering from 10 different places.

Looks like you're missing a crush washer, barrel nut, and a charging handle.