I partially agree with crowboy, mainly because of the other pain in the A issues. I don't use paypal, so the payment has to be by iternational money order, and then there are the charges, whcih can be hard to estimate since I'm not a business. That said, though I would not even start with a complete firearm, or a major part, if the buyer understands he/she is fully responsible to know the laws in his/her locale, and accepts the consequences of misapplication or lack of knowledge, I see no problem. Your biggest issue would be that the part gets stopped in Customs there, and confiscated. The buyer wants a refund and you are out the part. If you have a statement of acceptance of responsibility, so be it. Probably not that simple, though, as they still will scream.
I don't see any issue with a magazine.