http://palmettostatearmory.com/psa-16-mid-length-5-56-nato-1-7-melonite-freedom-keymod-lightweight-upper-no-bcg-or-ch.html
This is essentially exactly what I want to build for my upper.
1) Do I have everything I need in the parts list below (gas tube missing?)
2) Why are the components below so much more than the one above assembled (BCG aside)?
BCG: http://palmettostatearmory.com/palmetto-state-armory-5-56-premium-full-auto-bolt-carrier-group-8779.html
Barrel: http://palmettostatearmory.com/catalog/product/view/id/10141/
Upper receiver: http://palmettostatearmory.com/stripped-upper-receiver.html
Upper build parts kit: http://palmettostatearmory.com/catalog/product/view/_ignore_category/1/id/10258/s/psa-ar-15-upper-build-kit/
Flash hider: http://palmettostatearmory.com/ar-15-crush-washer.html and http://palmettostatearmory.com/ar-15-a2-flash-hider.html
Gas block: http://palmettostatearmory.com/odin-works-low-profile-750-aluminum-gas-block-gb-alum.html
11" Free Float Rail: TBD