I have a number of Remington doubles. The problem with getting the barrels off is Remingtons method of extraction of the shells and the linkage underneath.First you have to make sure the top lever is held all the way over, then with the barrels all the way down you'll have to play the barrels up and down. It's hard to explain, but no hammer is needed, just a bit of patience and fiddling around. When putting them back on,first push the extractors out.