Please correct me where I am wrong.

A rifle is not performing to standards and the owner brings it to the attention of the armourer. (I know you guys could repair anything with tin cans, bailing wire and duct tape--but bear with me here). The armourer agrees that repair is beyond his level and the weapon is forwarded to a higher maintence level with I suppose proper paperwork saying it doesn't work and probable cause is xxxx. If they agree, do they mark the rifle BLR in paint (beyond local repair) or ZF (stamped into the buttstock flat). I have seen both on different guns.

It finally goes to the unit that can repair it and the repair is done and all is fine but the sentencing marks are still on the rifle--either removable or stamped forever in the wood. Or do they grind/turpentine it off?

Now the question I have as a collector is, if I encounter those markings on my gun--has it been corrected or not? Was the gun surplused with faults? How do you guys tell if it was fixed or not with those markings still floating around? I have never seen a ZF cancelled. I can see alot of wasted time here. Thanks, p.
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