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Discussion Starter · #1 ·
Out of curiosity...
Which caliber lower did you use for your UMP Conversion.
Add whether or not you are having issues. I'm pretty sure that there is no dimensional differences
 

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9 40 and 45 all use the same lower
 

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Discussion Starter · #3 ·
Mine's marked 9mm I'm just curious how others are marked...and I guess why they're labeled with different calibers
C
 

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thats interesting. can you post a picture? i never seen a UMP lower caliber marked
 

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I'm curious as well. I shoot mostly 9mm now.
 

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Discussion Starter · #6 ·
I'll get a pic asap...I'm in Colorado and I bought it in a rush at a premium-ish price before the mag cap ban took hold here.
 

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Discussion Starter · #7 ·
I guess I could've waited...in retrospect
 

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In Germany, many parts (such are lowers) are required to to be serialized so many of those parts get a caliber designation. There is no actual difference in the lowers themselves.
 
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