Credits:
Script: TheRealYulikShvab
Models and animations: Spartan 112
Tested on Complete Edition, 1.0.7.0 and 1.0.8.0, but should work on older versions as well.
Download link:
https://disk.yandex.ru/d/epbSvvyTkuo5rw
About the "virus" problem. For some reason, some antiviruses flag .asi scrips in this mod as trojan. If you are afraid about it, here is source code from the mod
https://github.com/d3g0n-byte/WeaponAnimations
You can review it, edit it and compile it yourself.