Just don't do this in the Great State of Illinois,,, or take the gun there.

(720 ILCS 5/24-5)
Sec. 24-5. Defacing identification marks of firearms.
(a) Any person who shall knowingly or intentionally change, alter, remove or obliterate the name of the maker,
model, manufacturer’s number or other mark of identification of any firearm commits a Class 2 felony.
(b) Possession of any firearm upon which any such mark shall have been changed, altered, removed or obliterated
shall be prima facie evidence that the possessor has changed, altered, removed or obliterated the same.

Any other states have such a law?
Great looking custom guns, I think.