I dont think that's feasible for Payday due to a direct port of the BO2 model likely having many issues.

When someone wanted to work with me for a BO2 Peacekeeper port, we quickly found the first person models wouldnt fly in the customization screen due to the right side of the gun not being modeled and being a giant hole. The third person world model was incredibly low poly and would look very awkward in first person with their poor mesh smoothing.