What determines the secondary gun I get from buddy rescue?

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When being rescued by your buddy in a danger zone, your buddy will eventually hand you a secondary gun (pistol) that is not your own. I've noticed however that in Act 1 I get a rusted Star .45, whereas in Act 2 I've been getting a shiny Eagle .50.
So what determines the gun that will be handed to me? Does it have anything to do with the act of the game, or the buddy, or any guns I've purchased?
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