As titl, plasma gun shoots squares and i do not see anything on screen, just squares.

How show original ammo shooting from plasma?

Thanks
Edited 9.25 minutes after the original posting.

@kamtcho : Sounds like a shader is missing a texture. Best guess is this is from a shader conflict with another PK3.

I would recommend:

• Remove all PK3 files except the original ones and test if the plasma gun works correctly.
• If there are no issues, add back the Spiterbot PK3 and test again (or load the mod).
• Still no issue, add back the other PK3's, one at a time until you find the error.

What Tig said.
If you want to change the appearance of the Plasma Gun, you can toggle the cvar cg_oldPlasma between 0 and 1. Setting it to anything higher than 0 will turn the bubbly plasma trail off.
Edited 32.38 minutes after the original posting.