In case anyone is interested, I have made a machine gun that uses only one bullet sprite, and can shoot several shots at a time. If you fire about 6+ at once it get slightly laggy, but other than that it's perfectly fine. It is multidirectional as well.
http://scratch.mit.edu/projects/TheBajeebas/1182490
That's the link for the multidirectional one (doesn't work online for some reason, it can probably can be easily fixed though, but I haven't tried yet).
http://scratch.mit.edu/projects/TheBajeebas/1182461
That's the link for one that's only one direction, but works online.
If you use, please give credit. Enjoy!

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WOOZA! That's sweet.
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