I own a Beretta 390 shotgun which is my do-all shotgun for the field. I am considering buying an extra barrel for the gun and having a gunsmith cut it down to 18.5 inches for "home defense" and just because I am looking for a fun project. Is this a possibility with a Beretta 390 barrel? The reason I ask is because the barrel is a small diameter and it increases to a larger diameter near the choke tube area and I was just curious if a gunsmith could make a "cylinder" bore barrel out of the barrel or is the larger diameter of the barrel on the end of the gun necessary?
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