Slight update.
Spike's does not manufacture their own lowers according to the person I spoke with...
I am a machinist and have engraved lowers for people before, and I agree that this could be done very easily and not compromise the strength of the lower.
I know ATF requires Name, city and state to be engraved. Is last name sufficient or does it need to be the full name or first initial and last name. Also abbreviations ok? Such as W. for west or IN for Indiana. Thanks.