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2204 Views 3 Replies 4 Participants Last post by  Tactical Shooter
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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I cut and threaded to 7.25" on mine, overall 27".
Factory UMP is 7.87" from muzzle end to chamber face. That's what I'd put on my Form 1, FWIW.
I put 7.87. Be careful about having too much leeway on the Form 4.
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