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Discussion Starter #1
How does the factory UMP and USC w/UMP stock using HDPS Type B adapter stay folded?
When it is not locked in the extended position what keeps it firmly against the front of the receiver?
TIA,
TC
 

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Nothing unless there is a fair bit of tension in the hinge. The UMP has a "hook" on the front of the ejection port. The USC does not.

Some people have made hooks and attached them to their receiver others have used velcro.
 

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Discussion Starter #4
Thanks for the responses!

I had no idea........

Any photos of the hook or PM from those who make them????

Thanks,
TC
 
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