Longevity, Accuracy Tips for the AR15

[LRRPF52]

Quick question for LRRPF52. After you are through lapping the upper do you get it cleaned up, then blast, then Cerakote over the new Lapped area when you paint the upper? So that the metal isn't exposed. Thanks.

Yes. The best way would be for the manufacturer (machine shop who does finish machining) to get the face square to the raceway before anodizing. A good Type III hard coat anodizing is hard to beat for surface treatment on aluminum, because it basically case-hardens the aluminum to a fairly substantial depth, which helps prevent dimensional variation, corrosion, abrasion, and damage from impact. A 7075 T6 aluminum upper that has been anodized in that manner will last several generations easily, even in extreme tropical rainforest conditions.