Nice!!! I really like the 2nd Amendment engraving on your lower. I put together my first AR last year. I ordered a Stag , but got an Armalite. either are good names, so I was happy.
I used all Rock River Parts in the lower and went with a Rock River complete 16" A4 Mid-length upper that I ordered direct from the RRA factory. It shoots like a dream and is very accurate.
I got all my AR parts from Joe Bob Outfitters. They ship super fast and usually have a pretty good stock on hand. Their pricing also seems to be better than most. They also always have free shipping for orders over $90 (easily done when buying AR parts) and they add another 5% discount for Veterans by entering THANKYOU in the coupon code at checkout. I've always been very satisfied by their products & service. Here's the link to their website:
By the way, I went with the Hogue grip and am very happy with it.
Enjoy, it'll be a fun experience. Don't be afraid to ask questions when they come up.