For those of you in the military and stationed overseas, or those who do business with us, here is the definitive answer from the European Command Customs office.
> We have nothing prohibiting the mailing of firearms parts, for privately
> owned firearms for sporting purposes only, other than the frames and
> receiver for which, ATF approval is required.
> If you have further firearms questions, please go direct with our SME (subject matter expert)whose email is firstname.lastname@example.org.
> Robert Szostek
> Public Affairs Officer
> USEUCOM Customs Executive Agency
> DSN 381-8291 (+49-621-7308291)
> Fax 381-7324 (+49-621-7307324)
> On the Web @ www.hqusareur.army.mil/opm/customs.htm
And if you compete with an AR15, it is a sporting firearm.