Michael got the gun from lavatory of the restaurant. Aldo Trapani plants the gun in the lavatory before the meeting between Michael, McCluskey and Sollozzo.
The scene is an important one from the movie 'the Godfather'. In many respects, the time is a turning point in this film. It begins a mob battle and depicts Michael's shift from war hero to gangster. Additionally, it signaled a turning point in production.
The hit was carried out because the Corleone family employed lower ranking officers in McCluskey's precinct. As a result, they were able to learn McCluskey's whereabouts that evening and accurately deduce that the meeting would take place there.
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