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Discussion Starter #1
Can I swap a stock USC barrel with a UMP barrel? I know the NFA form 1 SBR requirement but will it be possible to replace it without modification? are they the same specs besides the lenght? can anyone shed some light.
 

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There is just a pin that holds it in, that you can remove manually.

I think Top-Notch Parts sells a replacement pin that is easier to remove than the existing one.
 

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Discussion Starter #5
There is just a pin that holds it in, that you can remove manually.
I think Top-Notch Parts sells a replacement pin that is easier to remove than the existing one.


I checked and saw the barrel pin, Do you use a punch to drive it out?
 

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Yes. Left to right or right to left, it makes no difference. I do recommend putting a drop or two of oil into the pin hole just to lube it up and help ease it out.
 

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Discussion Starter #7
Yes. Left to right or right to left, it makes no difference. I do recommend putting a drop or two of oil into the pin hole just to lube it up and help ease it out.
Thanks, I just email Ed from HDPS for availabilty of the 7.87" stainless UMP barrel. I'm mailing my form 1 tomorrow if this barrel is in stock. I really like my stock USC except for the barrel lenght. Maybe,(funds permitting) I will go ahead with the full UMP conversion someday. Right now, I have a form 1(SBR) & form 4 (suppresssor) pending. My immediate project is a suppressor for my USP 9mm after I get all these forms back from ATF.
 
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