I am going to say no. Everywhere in the military small arms and even their parts are very tightly controlled. You can't just take it home. If you lose/steal a weapon you can pretty much kiss your normal life good bye. The only possible way is if it was captured in the Gulf or something, and maybe welded shut. For example, in Bosnia/Kosovo there are allot of captured weapons around. Everything from old bolt actions, new in the grease M1A1 Thompsons, to MP5SDs. In the regular Army they end up getting destroyed, but some make their way to the SOF compound. THere they are used for "training" or sometimes welded shut and given away as a gift or something. But the times I have seen this it is always to units or whatever and not to individuals. Even if it was captured, SEALs are not so stupid to just give away a captured machine gun. There has to be paperwork, stuff like that. War Tropies have not been allowed since Vietnam or so, though I know that some SKSs, Yugo M76s, Drags and other non-full auto guns make there way back from the Balkans.