An assault rifle any rifle designed to fit between a Main Battle Rifle like a FN FAL, and a traditional marksman rifle, like a M1, they shoot intermediate cartriges like 5.56 or 7.62x39 and generally have a pistol grip and box mag. Full/Burst doesn't matter.
A civilian AR or AK can achieve full auto status with a ATF legal sear by using a slidefire stock, anyway.
I never used burst in the service, and my MK12 had full auto but that was retarded.
Anyway, heres my personal build I just finished.
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