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Concur.
By the time a 9mm round gets to the end of a 16" barrel it is largely coasting - the gas pressure is very low. There's a reason no military issue subgun comes with a flashhider, even in a 9 inch barrel - there's very little hot gas left. If there isn't enough to make a flash, there certainly isn't enough to make a brake effective.
If you just want to throw out money, I'm sure a smith would be happy to thread your barrel for a 9mm pistol muzzle brake. But don't do it if the rifle is an import - threads are illegal.
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