A suppressor for reducing muzzle blast and noise of firearms. The suppressor can include a baffle tube including a stack of baffle modules that are removably coupled to one another, and an optional blast baffle, end cap and end cap insert. The stack can be independently supported from both bullet entry and exit ends of the tube, with the stack under tension and the tube under compression. Two or more tubes of can be joined with one another at ends having corresponding sealing flanges, which also can center the tubes relative to one another. A blast baffle can separate pressurized gas into a first pathway through the baffle stack and a second pathway between the baffle modules and the baffle tube. The baffle tube and/or an expansion chamber tube can include a rearward end cap that is removable and replaceable with an over the barrel expansion tube.