This is a paid asset, but now you can download Sniper Xray Pack for FREE, but please remember 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
Sniper Xray Pack v1.0
“If possible, please buy the package to support the developer”
Sniper Xray Pack includes a example project with xray effect for your bullets. It includes a 3d rifle and a 3d enemy body with the skin, skeleton and organs!!!
-Brain and eyes
-Small and large intestines
-Liver, stomach and colon
It includes recharge animations for player.