[Navy87Guy]

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!

 

[kbinmt]

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

45 ACP 3 Lug Adapter .578-28 to HK 3 Lug

www.thesilencerstore.com

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

 

[UltraFudd]

^^^ What he said. Get the SiCo 3-lug and ask Tommy to thread it onto whatever barrel (threaded) you buy. I’d skip that flanged foreskin barrel. Too few cans use them.

SiCo 3-lug on my UMP:

 

[kbinmt]

 

[Tactical_T]

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/