I put a bunch of M9K guns in my pointshop items using this basic lua script:

ITEM.Name = 'NAME'
ITEM.Price = PRICE
ITEM.Model = 'WORLD MODEL'
ITEM.WeaponClass = 'WEAPON CLASS'
ITEM.SingleUse = true

function ITEM:OnBuy(ply)
ply:Give(self.WeaponClass)
ply:SelectWeapon(self.WeaponClass)
end

function ITEM:OnSell(ply)
ply:StripWeapon(self.WeaponClass)
end

And the guns only show up sometimes. PLEASE HELP