
It is pretty worn as he hunted with it a lot but still runs like a top. I always called it "the beast" as it is quite heavy. One interesting thing about these is that the whole barrel moves back into the receiver during recoil.
Another cool thing about these guns is that you can put an extended mag tube from a Rem 870/1100 on them to increase the capacity. As such guys have been buying up old Model 11s and 720s and converting them into defense shotguns. In that they are 70+ years old and in poor condition. They can still be found at reasonable prices. The 720s are typically worth less than the Remington. In it's present condition my dad's 720 is probably only worth $150-175.
I have a +2 mag extension off an old 870 I no longer use so I tried it on my 720. It works but I didn't want to cut down the barrel on my dad's gun.
Recently a shotgun advertised as a Remington Model 11 came up for sale on a local gun forum. I went and looked at it. It was in immaculate condition so I snatched it up for $250. When I got it home I looked at it closer. Turns out not to be an 11 but a variation called a "Sportsman". This one came with a "Polychoke" adjustable choke on it.

The "Sportsman" was 3 shot version of the 11 but came with a shorter tube, hand guard and a different tube cap. It cannot be converted to take more than 3 rounds without replacing the whole magazine tube assembly including hand guard and cap. There are not many if any of those available for a 70+ year old gun. If I can even find one it likely would cost more than the gun.
The good news is that the barrel off the Sportsman will fit on the 720. With the extended tube I could swap the barrels and cut the Sportsman bbl down. That would give me a 7 shot semi auto with an 18" bbl.
The 720 with the tube extension and the Sportsman barrel. I marked the barrel where it would be cut if/when I decide.

I'll take both shotguns up to my property and run some shells through them with the barrels swapped and using the mag extension before/if I decide to cut down the Sportsman's barrel.
The end result hopefully will be a 7 shot semi auto shotgun I can re-purpose into a self defense shotgun with ruining it's sentimental value and a 3 shot hunting shotgun.