No.
Cool kids don't play with legos.
double dong lower ftw!
The test drive went pretty much flawlessly.
Just a couple of questions.
First: is it normal for a new upper to be tough to adjust the front sight? I had ordered a sight tool for my tech sights on the 10/22 thinking I was killin two birds with one rock. Unfortunately it is a 5 prong tool and my AR is a 4 prong. I tried using one of my punches to get the post to turn but it wasn't happening. The two guys next to me used the same punch and adjusted both of their ar's front posts without a problem.
Second: I am ejecting brass very consistently, I believe but it is around the 2 o'clock position. I am under the understanding that ideally you want it to go to the 3-4:30 position. I have the ST-T2 buffer and full auto BCG. Would a SSS spring help? Possibly a lighter buffer?
Other than those two "complaints", the gun ran 150 flawless rounds through it. I was grinning from ear to ear the whole time I was there and the whole way home. .
Whatever you do DO NOT strip the buffer tube threads. You will not hear the end of it.