Identify this Shotgun

[emp1953]

I bought a semiauto Remington shotgun 30 years ago. The only markings are the typical Remington Ilion NY 12 - gauge 3' on the barrel and Auto12 on the receiver.
It is not an 11-87. I'm asking because I want to put a slug barrel on it and don't want to buy a barrel that doesn't fit.

 

[Brother Buckwheat]

I saw a post on Shotgun World mentioning what may be the gun you are asking about.

Remington Sportsman 12 Auto

Hello, I recently inherited a Remington "Sportsman 12 Auto." Does anyone have any experience with these guns, and their reliability. I am assuming this is basically an 11-87. I have seen some people refer to the 11-87 Sportsman, but this gun has no labeling as an 11-87. I am thinking this may...

www.shotgunworld.com

It may be based on the 1100.