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For rotor cannons, just search for 28mm Miniguns - max mini and Anvil Industries both do conversion sets. I'd be surprised if Heresy Minis didn't.

http://maxmini.eu/minigun-bits
http://anvilindustry.co.uk/Minigun

For heavy stubbers, use the ones from the IG vehicle sprue - they should be pretty easy to get hold of on bits sites.