m1 carbine 18,5 barrel

The one I bought a # of yrs ago from them was 18 5/8"...just that little bit more to make sure it doesn't screw in too short for the non- restricted class... While it did "index" perfectly to line up the gas popet, it was "short chambered" 15 thou, so if you want to shoot factory ammo it will require a turn or two from a chambering reamer.

If you re-load and have a brass trimmer the short chamber can be overcome by just shortening your brass to fit the chamber until the bolt locks fully, trim another 5 thou off and seat your bullets to an O. L. to a corresponding length and your away to the races.
 
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