This has been discussed on other gunboards besides here. So i wanted an answer and got one but it still is not crystal clear. So here it is.
Thank you for your recent inquiry to the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). This is in response to your email, dated December 3, 2010, in which you made an inquiry regarding the removal importer marking:
The Gun Control Act (GCA) of 1968 states: “It shall be unlawful for any person knowingly to transport, ship, or receive, in interstate or foreign commerce, any firearm which has had the importer’s or manufacturer’s serial number, removed, obliterated, or altered or to possess or receive any firearm which has had the importer’s or manufacturer’s serial number removed, obliterated, or altered and has, at any time, been shipped or transported in interstate or foreign commerce.” [18 U.S.C. 922(k)].
We trust this correspondence has been responsive to your inquiry. Should you have any further questions, please feel free to contact your local ATF Industry Operations Office. A list of ATF Office telephone numbers can be found at: http://www.atf.gov/field .
Firearms Industry Programs Branch, ATF