28 gauge/410 bore

[Jim Watson]

It is just a magazine tube cap made long out of solid steel to add weight to the gun.
http://www.jimsearneye.com/barrelweight.html

There are also mechanical and mercury filled "recoil reducers" that replace the cap and other versions that go inside the magazine, leaving room for just the one extra shell required for Skeet doubles.

 

[AKElroy]

+1 for the 1100 20. This gas action takes so long to lock up, it realy spreads the recoil over a long cycle. When I first hunted w/ my new Benelli Montelfeltro 20, I was getting slapped in the face with regularity. My hunting partner had a well worn 1100 20, and it is the softest shooting shotgun I have ever fired. I let him shoot my Benelli the rest of the afternoon while I took my limit w/ his 1100. We had a Red Label O/U in 28 on hand as well, and it was harder on the shoulder than the 1100. Definately sounds like you need a gas auto 20.

 

[oneounceload]

Dr. Tad -Jim beat me to it - in fact, Jims's Eye and Ear is where I bought it - small business that is great to do business with. (and I'm not sure if this is the same person)......I bought the whole cap and weight so i didn't have to drill or do anything - unscrew one, replace with the new.....why did I pick 8oz?....pure luck and guess work.......works AWESOME....before, that light 25" barrel was ALL over the place - with that weight on, and I felt like I was shooting my GTI, except in a gas gun in 28 gauge....but the swing was smoooooooooooooooooth

Whether you use Jim or someone else, it makes. IMO, a WORLD of difference

 

[win71]

And 1 oz. high speed loads are available for the 28 ga. I usually use copper or nickle plated #6's in the second barrel for pheasants.

 

[Scoupe]

Heres one that sold on Gunbroker.
http://www.gunbroker.com/Auction/ViewItem.asp?Item=125454594

 

[Virginian]

If you find anything that is a very effective wingshooting shotgun, and is easier shooting, than a Remington Model 1100 in 28 gauge, buy it. If you add the magazine cap weight and/or a stock weight, it will shoot even softer, but weigh a tad more. I routinely shoot mine one handed.