Just out of curiosity, what's the standard barrel life of a 6.5 CM? I've seen 308 last a long time. My M24 with the rock creek barrel is well into 5k rounds and only getting better groups.
So when I shipped a 1911 to my FFL back home, I just pre packaged it and wrapped it up really good and when asked what it was, it was precious machined parts and no questions asked. Totally legal