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You guys that have sbr'd your usc/ump, what barrel length and overall length did you in boxes 4e and 4f? I think I seem to remember someone putting 2"-14" for the barrel length as to give himself leeway, but I don't recall if that was on this forum.

Anyway what did you guys put?
 

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Factory UMP is 7.87" from muzzle end to chamber face. That's what I'd put on my Form 1, FWIW.
 
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