Can barrels be interchanged like a pump? I have been thinking of getting an 870 for Turkey hunting and also fitting it with a rifled slug barrel. A freind offered my a pretty good deal on an 1100, but I dont know if I can change out the barrels on a semi-auto. Should I wait for the right deal on an 870? Or should I jump on it for 200 bucks for the 1100? If the barrels can be changed out on the semi-....are they a lot more expensive? I sure would appreciate some help. I can see doing much up-grading for my Mossberg 500. I would rather have 'the right gun' before I start getting more barrels.