I say lap it.
Why? because there is this thing called tolerance. Nothing in the world of machining is perfect.
Who made the mount? Odds are it was the chicoms. With modern multi axis machine tools there is something that is not always obvious, the more modern and more complicated milling machine the less well trained the operator needs to be.
Do you think every chicom cnc machine operator graduated from chicom machine school with a 4 yr degree? Odds are they were grabbed out of farm fields and taught a few things and deemed good to go.
Then there is the fact that all these scope mounts are made from extruded aluminum, that is formed by being forced through a die while in a semi plastic-molten state. Why does that matter? extrusions have a ton of built in internal stress and this can manifest itself with heat caused by other finishing operations being performed causing the part to grow and change dimensions etc. This is why airplane parts are all made from billet aluminum, not castings or extrusions.
I found this thread because I was doing research on Vortex scope mounts and I just bought one, mostly because I like the way it looks and it is 2 ounces lighter then a Burris pepr, those things look like a bridge abutment.
I think my new Vortex mount is going to be awesome and you can bet I will certainly be the last guy in the quality control chain and lap that baby. I'm hoping it will just verify it is GTG but if it needs just a tiny bit of work to be perfect I'll know and take care of it right then.
I am always the last guy in the quality control chain, but that is really because I like to be and enjoy the process as much as I enjoy shooting the finished rifle.
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