Set variable in SWEP script and then check it on server?

[Leafdroid]

I'm trying to make it so when I fire a weapon, it sets

nextturn = 1

and then on the gamemode it does something like this:

function GM:Think()
if nextturn == 1 then
print("Spammy nextturn print")
end
end

Do I include the weapon script in the gamemode init or do I have to do it via networking?