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There is a selector switch for the barrel you want. Not both barrels at the same time
you don't
In the most general of terms, slug barrels are rifled and regular barrels are smooth bore. Both are capable of shooting slugs.
It has been a while, but if you load up both barrels you can either shoot one or both barrels. I don't remember exactly but you should be able to pull the front one back hard and shoot both or just the back one to shot the one barrel. If that isn't happening then you have a problem.
Hunting. Before modern rifles, hunters usually carried double barreled shotguns, with one or both barrels loaded with birdshot. If the hunter thought deer might be in the area, one barrel might hold buck shot (9 pellets each roughly the size of a .22 cal bullet). The gun might have a toggle switch at the back for left or right barrel, or two triggers. If you thought bears may be in the area you might load a slug round (a single pellet roughly equivalent to a .45 cal round) into one barrel. The phrase "loaded for bear" means you've got both barrels with slugs in them. You're expecting big trouble and you're ready for it. Or, you're paranoid. Also related phrase "gave him both barrels" is from similar origin involving double barrel shotguns.
With double triggers YES
No.
they are pretty much identical, both lightweight aluminum 2 piece barrels, take your pick
as far as i know yes, i have seen both receiver ends of both barrels and they are almost identical
Made near the turn of the century, most likely.
NO. But both these barrels are easy to remove and replace and there is a wide selection of factory or aftermarket replacement choices available for both guns.
Longer barrels to increase accuracy and fps slightly, but getting tighter bore barrels has a much greater effect on both. Also, the effect of barrel length works in a way that the longer a barrel is, the less effect a barrel extension has. For example, replacing a pistol barrel with one that is 3 inches longer has a much larger effect on the pistols accuracy than adding 3 inches to a sniper rifle barrel has on the sniper's accuracy. Fps increases with increased barrel lengths are usually negligible, while tight bore barrels can increase fps by up to 15%. If you are going to change the barrel I would recommend a tight bore over a longer barrel (if you can do both then go right ahead). When buying a stock gun, barrel length is something to consider though, because the differences can be quite significant, especially between "normal" rifles and bullpups.