[Guest]

Can the 25 rnd. UMP magazines be used in a USC without modifying the magazine or magazine well?

 

[S5TIIOwner]

The upper receiver needs to be modified. The opening in the lower receiver is also too small. Ppl just usually convert them to a UMP lower and stock.

Check out hdps.org

 

[dwillHK]

You need to use a UMP lower because the USC lower is just too narrow to accept double stack UMP mags. You also need to modify the opening in the bottom of the receiver as described above. Bottom line, there is no way to just stick a UMP mag into a USC without modifications.

 

[Guest]

Okay, thanks for the replies.

 

[Chris]

If you do the modifications, remember there's a U.S. parts-count requirement to keep your weapn legal. The Feds can be humorless.

 

[jimmybuffett]

If you really gotta have high-capacity in a USC without doing the UMP conversion, you can always get one of the new drum mags for it:

http://hdps.org/htm/DRUM-45--50.jpg

HDPS has them for $275 but they aren't in stock.

Otherwise, you have to do a UMP conversion. Do a quick search, you'll find tons of threads about the process. Here's mine:

http://hkpro.com/forum/showthread.php?t=54793