I'd like to pipe up here and say MP5.
They are relatively lightweight, especially the ones with plastic uppers, and more importantly, you can carry 2 MP5 magazines for the weight and space of 1 M4 magazine. An MP5 with collapsible stock and 10 mags would do you well in my opinion. They fair quite well outdoors as well.
Best of luck.
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Ár skal r?*sa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.
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