TMZ Sports has obtained the 911 call made by the Postmates food delivery driver who says MLB player Bruce Maxwell pointed a gun at her ... and she's clearly shaken by the frightening ordeal.
The woman tells the 911 operator she was simply trying to deliver a food order to the Oakland A's catcher, but things got bizarre very quickly ... culminating with a shirtless Bruce sticking a gun in her face.
The woman says she wasn't sure if Bruce had done anything illegal because it was all on his property -- but the operator quickly assures her that pulling out a piece on a delivery person is wrong.