Re: 1949 Model 37 barrel
that barrel was matched to that reciever.
they are not interchangeable without extensive smithing work.that goes for any gun with SN under 855xxx
if you want to go that route,i would contact les hovencamp at diamondgunsmithing.com
he knows old ithacas better then anyone can can explain your options.
barrels can be found on ebay or gunbroker etc.
your other option would be to add a polychoke.
polychoke were intalled as an option on new guns,but not done inhouse.
its pretty common to find ithacas from this era with polys,and some swear by them
Da hawk ate my baby!!