So, it looks like you have the TNARMSCO lower (it took forever for me to get) and the AP upper, which is the exact same setup I am building...yay us...I noticed that the profile of the upper and the profile of the lower do not match, leaving a land where the lower protrudes farther than the lip of the upper, making the two look somewhat mismatched. I am almost certain that this has no functional adverse effects, and you can you can confirm this, but I would like to discuss your experience with the fit and finish, and if you have any thoughts about whether you would have used a different upper or lower. I really appreciate your response, and hopefully I can contribute to your current or future builds. Thanks!