I'm not sure why firearms need serial numbers.
Do enough shooting and you'll see rifles with mis-matched serial numbers on bolts. Remington made a major error and started putting QR codes on the receiver, supposedly for assembly line QC but it seems to have had no effect in this regard as every R700 with a QR code has no engagement of the primary extraction cams, as a rule.
Not to mention the bedding surface being ruined...
In the UK, you are made to put serial numbers on barrels now...another stupid and pointless requirement.
I see the interest in 'home build' (think mecanno for rifle 80% AR15 receivers is on the rise in the USA. And for good reason. Combine this with 3D printers becoming more readily available and effective (look up 'PSR' who does evaluations of designs readily available to print online) and you'll see that the trend of 'kitchen/shed/attic gunsmiths' is starting to look more like a movement.
Ideas cannot be regulated.
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