Here is my shot gun. Both the my barrels are ribbed with a bead mid way down the barrel and one on the end.

 

Your shotgun looks stunning at the tip of your Barrel that's the piece I'm missing that little Brass Ball there's two of them up on top or its Rich mines missing one

 

I think they are have threads and screw into the top of of the barrel or rib. If they are broken off you would need to back it out so you can screw a new one in I also believe they were made in different sizes and can be bought in different sizes as well. There are tools made for installing them.

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As far as value they don't bring a lot of money. I paid $200. for mine earlier this year and another $100 for the extra full choke barrel. They are great shotguns and well built they just never gained on the Remington 870 and the Winchesters that already owned the market on the pump shot guns. I believe mine holds five without the plug plus one in the receiver for 2 3/4 shells and maybe 4 and one in the chamber for 3" shells.

 

They are chanbered for 3". It will hold 5 3" or 6 2 3/4".
I recieved my first one new for a Christmas present from my brother. It was around$120.00. Plane barrel. Bought a 28" mod., vent at a gun show, the slug barrel at another show, a 30' full through a member here and a 40" on another gun on an auction site. It has been a work horse for me. I have shot trap, hunted deer and rabbit, grouse.

 

I bought a new 120, 30 inch full (as most were) and killed a lot of jumped mallards with it in the mid 70s in Colorado. Excellent, all-steel guns, but very heavy. I remember I gave $151 for mine when they first hit the market.

 

I was all over the Gorewebs and saw nothing to help put mine back together. It would not lock up, correctly,sometimes. I was here about to send a SOS but found a problem and got it back working or at least assembled. Thanks for nothing Remlin

 

Shocked that there was no videos on this shotgun except seeing it fire.

 

I doubt the OP will mind. So I decided to see how the ole gal would hold together after surgery. This had a longish barrel and a Cutts on it that I hacked off immediately, after buying. Its almost my only shotgun with a bore for slugs, being cut to legal plus maybe an inch. First shot was off almost a foot due to uncertainty. A few guys were there and watched closely knowing I dont hunt. My shell cuff put a hurting on my lip and teeth but I tried 2 more. We were shocked. The high viz sights worked well. 45 yds or so. Shell cuff with plastic birdshot.