Update..jus got this in the mail today..
The 14.7 is awesome, it makes the AR a nice lil package. Using the ATF approved Dowel measurement method (closed bolt, put dowel down barrel and measure to the end) It was 16 1/4" , so there was some wiggle room, I had them use PEEL washer to make sure the A2 was perfectly aligned on barrel.
I liked the PRI flip up but the protective ring around the top may be a bit big. Its pretty big,,but it may help with target aquisition and not have to hunt for the sites.
Range report this weekend.