I've bought 2 870 smooth bore slug barrels for $50 ea. Check around. Check ebay. Sometimes you can find a used 870 with a slug barrel, buy the gun with 2 barrels, sell it with one and break even. 870's aren't to hard to sell if they are cheap enough & if you look around you can usually find a deal. Hastings makes a very nice rifled slug barrel for the 870. Depends on how long of shots you're going to take. All I've ever used is the smooth bore. My long shots used to be 40 yards. Now I take my black powder for long shots.