I'll start:
Thwap thwap thwap thwap
Edit 1: someone already answered it it was the Zhalo Supercell.
Edit 2: if this hits 3000 replies I'll change the title
Edit 3: it's funny looking back and seeing the posts before the title change. Here's the original title:
[spoiler]Post what noise your gun makes and people will try to guess what gun it is.[/spoiler]
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Pshbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb [b][i][u]BANG[/u][/i][/b] *scream*