Lapping upper receiver


#1

I have a few aero precision upper receivers and my ?? is do I need to lap them or does it matter?


#2

I would lap them, there is always a little bit of an issue. I think it helps the barrel nut seat better anyways, anything that makes the bolt lock and release better eliminates future problems.


#3

Why would anything need lapping? I’m lost on this.


#4

It eliminates canting of barrel extension in receiver.


#5

I started doing it on all my builds and have yet to find an upper regardless of make that doesn’t need it to some extent, just some more than others


#6

Does the factory do this before shipping? QC…