23 guns seems excessive and unnecessary for one person to perpetrate what he did. Even if he thought 1 or more guns might jam, having just a few extras should have been sufficient in his mind to ensure he could keep firing. He lugged 23 guns to the 32nd floor so 20 of them (or however many sat unfired) could just sit there? It's been reported that he had two rifles fitted with bump stocks to simulate the action of an automatic rifle. I didn't hear much if any single fire shots on any of the audio so he was probably primarily using one of the bump stock rifles or alternating between the two. Sounds to me like there's a possibility he might have expected to have some help that may not have shown.

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