This is a paid asset, but now you can download ANIMSET: SHOTGUN for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
ANIMSET: SHOTGUN v1.5
***Included Inside upcoming ULTIMATE ANIMATION COLLECTION***
In need of some high quality shotgun animations for you project? Then look no further!
This animset currently includes 180+ humanoid motion captured animations (60+ being root motion variations): walk, run, crouch, take cover, shoot, throw grenades, get hit, death and more…
Check out the animset in a WebGL Viewer