If the seller is Bastelsexy from Germany, who is a stand up guy, or anyone outside the USA, the advice is DON'T. The problem is if you buy ANY gun part, including match weights, if the cost of the item is $100 or more then you must, in order to stay legal, file a Form 6 with the ATFE and get approval before importing the part.
Buy from Robert and don't worry about getting into legal problems. His prices are about as good as you will find stateside and he has done all the importing BS for you.
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