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If you know your gun, you can fix anything. It could have been a simple shim job and the gun would shoot right as rain. UMP's may be a more rare item as far as popularity and upgradability. However, if your looking at internal upgrades you need parts that match the version of the gearbox. Shorter barrels can be less accurate then say an M16 but you also need to consider what your going to be using this weapon for. Woodland? CQB?
Get verified and come on down to the classifieds, you'll kick yourself for buying over priced stuff and waiting 3 months at 007.
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