Good to hear you have one and would buy one. This particular 311 has a 30" barrel. Not sure the choke on them, possibly you can help me figure it out. I used a micrometer on the inside of the barrel both beginning and end and I dont remember the reading but both sides measured the same. Also, a dime fit in both left and right barrels.
I just pulled the 311 out, and broke it down. On mine, which is mod/full, 30 in, 12ga, on the underside of the left-hand barrel, in the area which would be covered by the action when it is together, is a letter "F", enclosed in a circle. The right-hand barrel is modified, the left on MINE is Full.
I personally think they are great guns, not matched by many of the newer, foreign-made, glossy stocked and much higher-priced shotguns.
I have 3 sxs shotguns, a couple of pumps, buncha single shots, and two combo shotgun X.22 guns. I like old guns, and am a pheasant hunter, if asked what I like to do.
Your choice, of course, but I wouldn't hesitate.
Best wishes.
Edit: You aren't planning to shoot slugs are you?
Havent got that far! Why do you ask?
Although one CAN shot slugs through a full choked barrel, it is not recommended. The slug likes a little room in the barrel, and can--not necessarily WILL--get constricted at the choking swage and may (MAY) bulge the barrel a bit. From a modified choke on down to an open cylinder, there is enough room for passage, but generally, shotguns made specifically for slugs (police/military/deer hunter) have an open cylinder barrel. IN the last 20 years or so, some guns have been made with rifled barrels, especially for slug shooting, and are VERY accurate out to 100 yards or so. I had an Ithaca model 37 police special/deer gun which had a deliberately crafted barrel, with the choke gradually running the length of the barrel, instead of being at the last four inches or so. It is a VERY accurate shotgun, but more expensive to make, and no longer available.
It really isn't a drawback, but some folks want one gun to do everything, just as some folks want their boats to be everything.
Conceptually feasible, but not likely.