As far as the history of Warhammer 40k goes, probably not. Whilst the Imperium is creating new technology by the minute, Chaos and traitor legions have to steal the tech that they use. Some equipment a chaos marine's army might use can predate the Heresy.
But as far as actual rules it's up to you and your opponent. Some house rules (rules for a specific place) state weather you can or not, but to my knowledge if you enter a games workshop Tournament you MUST use only what is in your codex.
No. You can however use lesser demons and demon princes in a Chaos Space Marine Army.
long toma duck
That depends on the types of models are in it! You can find a 3000 point chaos army with very little HQ or Elite units.
they have to learn how to use a real cannon in the army
That challenging the army would lead to chaos
It all depends on your playing style
with skill and a touch of magic :)
There's none! But if you ask me the best army is the marauding forces of Chaos! But the game is entirely based around finding the army best suited for you.
A small cannon loaned by the Mexican Army for protection agaainst Commanche raids.
They refused to turn over their cannon to the Mexican Army.
A small cannon on loan from the Mexican Army for protection from Commanche raids.
the world would be in chaos and ther would be hardly any people on earth.