I've never engraved shit on my lowers, but I know guys who got correspondence from certain examiners requiring it. My opinion, for what it's worth, is that the engraving was meant for actual manufacturing... like an F1 can, for example... where you don't have an original manufacturer's serial number like on an existing AR lower. But along the way, booger eating bureaucrats at ATF perverted the engraving into SBRs of existing firearms.
There's no practical value to it other than adding another roadblock to getting your firearm set up how you want it.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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