Why would the rifle need to "make it out of Romania" the firearm is currently in the USA. IF your local police authorities agree playing Soccer with a Gatling gun is against the law then I'd recommend you not buy one. However for those who do live in America are legally allowed to buy, sell and transfer this gun depending on individual state laws.
It's a simple solution the OP should specify this sale is for USA only.
The OP specifying the sale is restricted to USA is a good solution; however, IMHO people should read posts before hitting reply since
Maidak said he is from Ohio (an US State) and will send the item only to FFLs (an US establishment). Also foreign trades of small arms are regulated by international laws as well as defence regulations across the world so it almost impossible for a guy to legally sell/buy it from internet forums and have it at his home on the far side of the world. As an example, here in Italy such an assault rifle is categorized as
"Arma da Guerra" and its use & ownership is reserved only to Armed Forces and police forces; also, in Italy mail-order shopping (or on-line shopping) of small arms (pistols, shotguns, rifles) are illegal and the district chief (Questore) of the State Police must know & authorize all transfers of arms. I'm sure scores of foreign countries have various regulation in place and if someone is willing to buy small arms for himself he must be knowledgeable of the applicable law.