Weapon-specific Base Damage

The basic damage (before Gear, Bonuses, and Perks) of a shot from a weapon is your Loadout Attack multiplied by that weapon’s Attack Multiplier:

Gun Attack Multiplier
Auto Gun 0.42
Looper 0.7
Blaster 1
Plasma 1.6 (blast damage is x0.75)
Gemini Laser 0.6
Laser Rifle 2.15

Note that the Plasma Cannon’s Blast Damage is not affected by Gear, Bonuses or Perks; whereas the Looper’s Indirect damage is.

PS I’m still testing the Gemini Laser