I'm not a lawyer either, but I did sleep in the dumpster behind the county courthouse last night.

We have been given some good information above, but also a lot of not-so-good information.

First, the Gun Control Act of 1968 requires that all firearms imported into the US be stamped with the name, city, & state of the importer. (It takes an act of Congress to import without this mark, & that is exactly how CMPicon was able to bring in rifles from Greece, Italyicon, etc without it.)

Second, GCAicon 68 requires importers to stamp a new serial number on any gun that does not have a serial number containing only Arabic numbers. So, your Russianicon guns with a SN containing some Cyrillic characters have been stamped with a new SN; in this case, it is the importers SN that cannot be altered.

Third, an import marking can be removed by anyone, once the firearm is in the US. Scratch it off, change the barrel, do whatever you want, it is all good. The fellas with the bulges in the cheap suits have never had a problem with this.

Fourth, "Blue Sky" imports also have the importer's city & state (Arlington, VA) stamped on them. Most, maybe all, were used by the South Koreans. Most were heavily used & abused. The Koreans ran out of many spare parts at some point, & their armorers sometimes made repairs that we would not; e.g., if a carbine bolt lug broke off or cracked, they would weld it. Many barrels were literally shot out. When they did a complete rebuild, their version of parkerizing was poor; it looks like chalk, & you can permanently scratch it with your fingernail (at least, I did on one in a store).

Sure, you can buy an import marked barrel if you want. But, you have to ask yourself, would someone take a perfectly good barrel off a rifle for the heck of it?

You may find a good Blue Sky rifle, but you had better know how to evaluate it before you buy; the odds are against you.