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Wilfredo, just the conversion barrel and a 9mm magazine for feed reliability Sir.
Many of the Glocks will work fine with just the barrel swap. Others you may have to get a 9mm magazine and an ejector ($8 from Glock).
Often times you will just need the conversion barrel and a magazine. In fact I have been successful doing just that. You could add the ejector but I would only do so if the previous set up is troublesome. Personally I would not carry any firearm for defense of life with a conversion barrel set up unless it's been proven to get through 250 (my arbitrary number) rounds of the self defense ammo of your choosing. Obviously opinions may vary.