[S5TIIOwner]

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.

 

[Landpimp]

someone was making the hooks and selling them here......forget who.

 

[ThompsonCrazy]

Thanks for the responses!

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

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

Thanks,
TC

 

[S5TIIOwner]

http://hkpro.com/forum/showthread.php?t=57341&highlight=UMP+hook

 

[ROCKETW19]

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

ED is workin on a tab for this according to his website!