This is my opinion, not the rules, so it is clearly up for debate.
I think it is cheating. It is not meant to be a fully automatic weapon in real life, it is a shot per trigger pull, therefor it should be 1 click = 1 bullet fired. Hopefully a senior admin will voice the ruling soon, but as of not I would convince him to stop until discussed further.
Thanks for the heads up though!
-L