M1 carbine barrel

[tenOC]

Said to be later production. For free use program? (just from old memory). I have one. Not rare like the book says. Not common either.

EDIT: Though I haven't paid attention to how my gas cylinder is configured. So...take that for what it's worth. Win made some of these barrels with a kerf cut behind the rear sight. Maybe not an I-cut. Mine is too buried to hunt down right now.