Mine

function SWEP:Think()
	if self.Owner:KeyDown(IN_USE) and self.Owner:KeyDown(IN_ATTACK2) then
		if self.LastToggle>CurTime() then return end
		if self.Hold==0 then
			self:SetWeaponHoldType( self.HoldType )
			self.LastToggle=CurTime+1
			self.Hold=1
		else
			self:SetWeaponHoldType("none")
			self.LastToggle=CurTime+1
			self.Hold=0
		end
	end
end