[Service] AR-15 Upper Receiver Truing

As our in-house armorer has shipped out for the season, we have contracted with a trusted local gunsmith to lap and true the front face of your upper receiver.  Anodizing is a growth or the aluminum which creates irregularities in thickness that may prevent a flush seating with the barrel extension.  Similarly, cerakote can be applied in uneven amounts resulting in a similar issue.  Truing the receiver face creates a flat service to ideally mate the barrel extension.