By length I assume you mean the distance from the start of the chamber to where they stop at/near the taper, correct? The two that I have apart right now measure right about 1 9/16 to 1 5/8 (the .243 measures 1.570 and the 7-08 measures 1.605). Of course the last two threads or so are unusable and about the last 5 are covered by the barrel nut where it is relieved on the muzzle end. So when you say "factory length" mine vary slightly from one to the other. Hope this helps you out.
Bookmarks