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UMP bolt doesn't always stay locked back

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Old January 8th, 2017, 16:30   #1
NAAZ
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Join Date: Aug 2016
Location: Trenton, ON
UMP bolt doesn't always stay locked back

after last shot is fired, it locks back.

when you insert an empty mag and charge the handle, the bolt locks back.

but if I charge the cocking handle under control (very slowly) past the locking point when it's locked back already with empty mag, sometimes the bolt goes forward.

the make is VFC UMP
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Old January 8th, 2017, 16:38   #2
ThunderCactus
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bolt catch spring issues? Maybe the catch is rounded?

Has anyone even worked on a VFC UMP yet? lol
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