Well, if it's got to be a small arm, then an automatic rifle / light machinegun is the preference for the ability to lay down sustained fire at a high rate.
First option though is a grenade launcher, preferably something along the lines of a Milkor MGL or similar.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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