I have a beam rifle tag , but the beam rifle can damage nothing. This is H2 beam rifle, not the red one. I don't know how to fix it, may be the beam can't touch objects, or this weapon is too weak.

Could you help me?

I swear this should be in Technical, but w/e.
Go into the weapon tag. Go down to the part where it says what projectile it is. Open the projectile. Scroll down to "impact damage", open that tag up. Check if the damage modifiers for various surfaces are different or if it does any damage.

OR

Go to the sniper rifle's .damage_effect. Copy it and paste it into the beam rifle folder. Delete the old damage_effect, and rename the copied sniper rifle damage_effect into whatever the original beam rifle damage_effect was named.

HOPE THAT MADE SENSE.

Thanks for you help! The tag doesn' link with any damage_effect tag