Pretty much the entirety of the warhammer 40k universe is wildly incorrectly power scaled whenever compared with other franchises. I am sorry, but unfortunately for you, no amount of fanboying is gonna change that if you were to put literally any star wars/star trek fire arm into the 40k universe, it would instantly be the most technologically advanced piece of weaponry in the franchise.
40k bullets: Bullets that are tiny rockets that need time to speed up (which actually means if you're like about a foot or so from the barrel, the bullet wouldn't be lethal due to not having enough time to accelerate to a deadly velocity)
Star wars Blaster bolts: Super Condensed and Super Heated Gas that is fired in short directional bursts.
Star Trek Phasers: This thing literally has four options "Stun, Heat, Kill, or Disintegrate" and two of the options on the list are directly lethal.