I am building an upper, never built one before so am trying to piece things together. I have an Aero Precision stripped upper with the forward assist and dust cover already. Now I am looking at the rest.

Am trying to build a carbine length with 16" barrel.

My biggest question is will all these parts work together? And am I missing anything I need to buy parts kit wise?

https://ballisticadvantage.com/melonite-carbine-gas-tube.html - Gas tube with roll pin
https://ballisticadvantage.com/16-inch-556-carbine-cmv-modern-barrel.html - 16" 5.56 Government Profile Carbine Length AR 15 Barrel with lo-pro gas block
https://www.at3tactical.com/collections/at3-quad-rails/products/at3-prolok-m-lok-ar-15-free-float-handguard-10-12-15-lengths?variant=43066322259 - AR15 Free Float Handguard 12"
https://www.at3tactical.com/collections/muzzle-devices/products/at3-tactical-ar-15-a2-mil-spec-flash-hider-with-crush-washer?lshst=collection - Flash Hider
https://www.bravocompanyusa.com/BCM-Bolt-Carrier-Group-MPI-Auto-M16-p/bcm-bolt-carrier-group-auto-mp.htm - BCM BCG

I have spent the last month on and off trying to find the correct parts, that are in-stock, and fit together.

a charging handle  and bcg and irons, crush washer for muzzle device

Forgot I have the charting handle. Looks like the flash hider comes with a crush washer. I did forget about irons though. Thank you.

Looks like tools and grease and you're set.

Awesome thank you. I have some of the tools, but not near enough, heh.

Looks like you’re about set. Have 4 BA barrels on rifles/pistol. . You will be happy