The lower velocity of the ump's .45 acp works very well for hostage situations when over penetration is unacceptable. Also the mag capacity is only 5 less than a standard mp5 mag, and it if you considder that with .45 you may only need two rounds, where as you may require three or more with 9mm, its reasonable. The only real downside is that all the polymers used to keep the weight low means that the gun will not soak up recoil as much. The integril rail is nice though.
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