Hello everyone. I am relatively new to the world of shotguns, so this might be a very basic question. Sorry if it is. A couple of months ago, I had the opportunity to purchase an 870 super magnum from Remington for a good price, which I did. I never hunt, but really enjoy pigeon clay shooting, so its 28" barrel was very appealing. I also was planning on buying an 18" barrel for home protection. So here is where my confusin comes in. So my 28" barrel said 12 gauge, 2 3/4 inch, 3 inch and 3.5 inch shells. I bought an 18 inch barrel from Cabellas, which says 2 3/4 inch and 3 inch. No worries, I thought. I plan on using ONLY 2 3/4 shells But then my friend was like "Oh, it depends on the receiver. Some receivers can't take short barrels" I cvalled Cabella's and the tech rep gave me some super convioluted answer, which left me even more confused. I thought all barrels for 870s were interchangeable!!!! I guess I can try it, but no range around me allows 18" barrels, and I haven't ahd the time to drive a couple of hours to one that does. So... my question is. Can I use an 18" barrel on a Remington 870 express suprer magnum, with original 28" barrel, or is it going to explode in my face Thanks a lot!!