Twin-linked Weapons
In the new Warhammer 40,000, twin-linked weapons instead get double the number of shots at half range. - was removed - website changed. Now just double number of shots.
Combi-weapons
Another type of weapon that is changing is the combi-weapon. While in the current edition you can only shoot the “specialist” portion of the gun once, in the new Warhammer 40,000 you can either shoot both all the time, but at a -1 to hit modifier, or choose to just shoot one with no modifier. no longer just one-hit-wonders with those shooting attacks.
Explosives
in the new Warhammer 40,000, these are resolved much faster by just using a random number of shots. This represents either how many warriors are caught in the explosion, or how direct the hit is on a larger single-model target. Otherwise, these work exactly as any other shooting.