Which set is this 2017 bag 3 with dark red and grey pieces from? I'm trying to find out what set this is from.  I'm having a really hard time looking this up QR code 6171967.
Judging from the minifig torso and the selection of pieces in the bag I believe you have bag 3 from set 76104 The Hulkbuster Smash-Up from 2018.