RE: Remington 1100 Question
Yep, you can't shoot 3 inch mags in a 2 3/4 receiver...
I've owned an 1100 since the mid 70s, with their smooth slug barrel...I need to buy a replacement barrel as well...There's nothing wrong with a 2 3/4 chamber, plenty of hunting you can still do with it...
What are you planning to hunt with it???