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Discussion Starter · #1 ·
I’m going to be submitting the paperwork to SBR my TB UMP conversion (it still has the 16” factory barrel). I plan on getting an 8” HDPS barrel and keeping the stock USC barrel “as is”.

My question is about the purpose/usefulness of the flanged barrel. The threaded barrel is pretty obvious, but I can’t figure out what purpose the flanged barrel serves. It’s not the tri-lug configuration, so what purpose does it serve?

I'm 99% certain that I’ll get the threaded version, but I just wanted to make sure I wasn’t missing something!
 

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The flanged looks original, but unless you have a suppressor with a mount for the flange, meh

There is some cool factor, no doubt. But if you are going to shoot suppressed there are better options.

I've posted about my preference

,
and I like the silencerco b&t pattern mount and adapter too.
 

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To this day, I cannot figure out why HK made the UMP with a flange mount barrel, especially when their 3-Lug 9mm barrels had done so well. If you're never going to run a suppressor, then the traditional flange mount barrel is the way to go, as it's more authentic and allows for attaching a flange flash hider. But it you want to run a suppressor, 100% go with a modern 3-Lug barrel set up/
 
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