Someone asked me for the Peacekeeper weapon and I couldnt use the Mk2 model from BO3. It had to be the og Peacekeeper from BO2.

The first person models will only have left side of the gun modeled because Xbox 360 era console moment. Viewing the gun in the Blackmarket or inspecting the gun in gameplay will show the right side being a empty hole.
The third person world models are too low poly to be useable.

So any BO2 weapon models are unusable for Payday purposes, but you can get a close enough substitute from pawcio's XM8 mod.
https://modworkshop.net/mod/18998