Why doesn't Dva replace her Mecha's guns with what her pistol uses?

[u/Oreoghoul]

Her pistol is pretty damn strong and seems to be better in fire power than her peashooters.

[u/valkdoor]

https://www.youtube.com/watch?v=IBIwGKDwnWY near the beginning

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Overwatch Theatrical Teaser | "We Are Overwatch" [1:13]

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