Quite personally I think you should just get a specialist and a mini gun to bother f**k out of people <_<
But a more practical use would be to buy 7-30day guns.
Personally I bought an M416 CQB and it was pretty good :D
Anyway, your choice have fun!
P.S. - if you gift me a mini gun for 7 days I'll love you forever (no homo)
-XSoLX- :p