Of course there is a way

1.- Check that you viewmodel and animated model have tag_weapon instead of j_gun
2.- Do the same with all the xanims except the ass ones (tag_weapon instead of j_gun)
3.- Be sure your ads_up and down have tag_view+tag_torso ot tag_view+tag_ads ( I personally use tag_view+tag_torso)

What is the difference between the viewmodel and the animated model?

Any clue on how to fix this?

Not sure what to do. I should have everything set up correctly, here's a video of my problem. The video includes some footage of my weapon setup in asset manager