[HamletEagle]

Originally Posted by liubili it can sub-model be done, but it's takes A LOT of work. 4 months work - https://www.youtube.com/watch?v=WVnjP2YTczQ

Let's be honest. Knives submodels are tremendously easier that doing submodels for the other weapons(because client only predicts in deploy - which can be seen in your video too, that little snap). I did it before in a few hours.
Submodels for guns are more complicated but it's still not nearly 4 months of work.