Barrels from Models 120, 1200 & 1300 are interchangeable. If the gun was originally 2 3/4" that is all it will shoot even if a 3" barrel is added. You might just do a good cold blue job on the original barrel then look for an affordable Winchoke barrel for hunting. These are good reliable guns but have usually more sentimental value than collector value. I have one that is over 40 yrs old that was a gift from my Dad that is priceless to me. It's been used but not abused and has put everything from dove to deer on the table. Good luck on your search

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KMAG YOYO