[Cheapshooter]

What does "original condition" mean anyway? That is impossibly vague. One could argue that it means a firearm exactly as it left the factory, with no wear and no replacement parta - in other words, no milsurp need apply.

The rest of the quoted answer:

It is also the opinion of FTB, however, that a minor change such as the addition of scope mounts, non-original sights, or sling swivels would not remove a firearm from its original condition. Moreover, we have determined that replacing particular firearms parts with new parts that are made to the original design would also be acceptable-for example, replacing a cracked M1 Grand stock with a new wooden stock of the same design, but replacing the original firearm stock with a plastic stock would change its classification as a C&R item.

From the BATF FAQ page: http://www.atf.gov/firearms/faq/curi...#modifications