My question is how to do something like GL or Grip, so it blocks 1st perk.?

You would need to explain more as what you've said doesnt make much sense.

I want to make one attachment disables perk 1, and thas it, how to change it

The GL or Grip attachments already disable perk 1 so I dont get what you are asking for.

so what if i want to make red dot disable perk 1, HOW THE F**** SHOULD I EDIT THE CAC_SOMETHING

There is no point thinking about disabling perk 1 in cac.inc as you cannot compile all 5 of the cac_ menus. You will get the exceeding 328 menu defs error. But you do it at the spawn player. So, in maps\mp\gametypes\_class::cac_getdata():

		if ( primary_attachment_ref == "grip" || primary_attachment_ref == "gl" || || primary_attachment_ref == "reflex" || secondary_attachment_ref == "grip" || secondary_attachment_ref == "gl" || secondary_attachment_ref == "reflex")
		{
			if ( specialty1 != 190 && specialty1 != 191 && specialty1 != 192 && specialty1 != 193 )
			{
				println( "^1Warning: (" + self.name + ") grip or grenade launcher is used but perk 1 was index " + specialty1 + ". Setting perk 1 to none." );
				specialty1 = 193; // 193 = there's an attachment, so no perk
			}
		}

If you want it so that perk 1 is disabled if any attachment is used:

		if ( primary_attachment_ref != "" || || secondary_attachment_ref != "" )
		{
			if ( specialty1 != 190 && specialty1 != 191 && specialty1 != 192 && specialty1 != 193 )
			{
				println( "^1Warning: (" + self.name + ") grip or grenade launcher is used but perk 1 was index " + specialty1 + ". Setting perk 1 to none." );
				specialty1 = 193; // 193 = there's an attachment, so no perk
			}
		}

Yeah, thats it