Where do I need to measure from where the barrel comes off the receiver? Is 20” where it works best or is that the shortest it can be?20"
I used a hacksaw for the one I did and cleaned it up with some diamond files.
Legally its 18.5" from the back end of the chamber to the end of the barrel
This, and it includes the chamber.The minimum is actually 18.0".
https://www.atf.gov/firearms/qa/which-firearms-are-regulated-under-nfa
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