Welcome to the forum and thank you for your service.
It looks like you have a list of good parts. I do have a couple of questions though. Is this the buffer kit you have? Is it a carbine extension or rifle extension? What is the diameter of your gas port? I assume it is rifle gas length since that is what gas tube you purchased.
The Arizona memorial is a must see if you are in Hawaii. It is a solemn experience that is well worth the time and effort. It is humbling to see the names of those who survived the attack but were returned to the Arizona after death. They felt so strongly about their lost shipmates that they wanted to return to them for eternity.
Not the best ammo, but it is brass cased for 50¢ a round.
https://aimsurplus.com/winchester-45-auto-230grn-fmj-50rd-box/?mc_cid=94f98f81c2&mc_eid=321b9a83da
Hi @Nate37. Welcome to the forum. Start an introduction thread to let us know a little more about yourself.
https://forum.308ar.com/forum/22-introductions/
Cake is for tomorrow. If you hurry, you might get here before it is gone.
It is a very basic chocolate box cake with chocolate fudge frosting. It is how my mom made them for 60 years.
With a ~7 inch receiver extension, you need a 2.5 inch buffer that weighs 5.4 oz. An AR15 carbine buffer is too long and too light. As was linked above, the Armalite carbine kit will work very well.