Witness Marking Utensils for Marking Receivers
Could someone tell me exactly what kind of marking utensil is used for making the witness marks on the fasteners on an AR??
I'm sure you've all seen those little witness marks that are seen many times on AR receivers, to show IF a screw ever comes loose, right? I frequently see these witness/hash marks on Aimpoint fasteners, optic mount fasteners, and BUIS fasteners. Sometimes I even see where guys have used the same marking utensil to number their mags. (usually aluminum mags, but I'm not sure if this marking utensil would work on PMAGS or not? I bet it might though).
Now I THINK I have seen these witness marks in BOTH white AND a light-bluish color maybe? It's almost an "aqua" color I think? Not sure. I know for a fact I've seen white, and some sort of "bluish" color. ?
What kind of marking utensil is used for this purpose? I originally thought it might be some type of paint marker, but I'm not so sure that's what is being used???
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