Here’s a look at the device. A bump stock replaces the weapon’s gunstock (the part of a rifle to which the barrel and firing mechanism are attached). The bump stock has a “support step ...

Mass shootings in the U.S. have become a quotidian part of American life ... from firearms would seem easy – just sell any gun stocks you might own. But where things get complicated is when ...

It replaces the weapon's stock, which is held against the shoulder, and allows the rest of the rifle to slide back and forward with every shot despite having no mechanical parts or springs.