12-20-2013, 06:13 PM
LRRPF52 Wrote:I've mentioned it some other threads, but I wanted to share it here as well. As I have been truing uppers in preparation for the Lilja barrels, someone asked me to check their AA upper I have.
It was literally the only one that is dead-on true, not making it up. I didn't even think to check it earlier because of all the irons I have in the fire, so I was pleasantly surprised to see that not only was it perfectly true, but that it was anodized after being trued. It also was trued as part of the normal machining process, because there are no telltale signs of a lapping job. On top of that, the extension tunnel is very tight with several of the barrels I checked on it.
If all the AR15 uppers were made to AA's forged upper standards, there would be no need for this lapping tool.
If I were to put a retail value on an AA forged upper, it would be somewhere between $160 and $200.
Just got my tool in the mail today and checked the 3 Aero Precision blemished uppers I have on hand. Pleasantly surprised to find zero gap to be corrected. I will say the coating appears to be a little thick on 2 of the uppers in the interior where the BCG goes (rear of the ejection port) as I had to use the drill to rotate the tool to get it fully seated inside the upper (even with copious lube). The third slid in almost too easy for my likes, but I had already reserved it for my wife's .223 build due to a little play between the upper and lower (there is so little that she won't notice) so I am not too concerned about it being too loose for the barrel extension.