Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download FPS Handy Hands Free.
FPS Handy Hands v1.1
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FPS Handy Hands is a set of high quality first person hand models.
Features
NEW – now includes both male and female generic hands!
Boned and skinned! – Pose these hands to hold any weapon right in the Unity editor! Or take the included FBX files and animate them in the animatation package of your choice.
Left and Right hands included as separate models for maximum flexibility.
Highly detailed and smooth – 5000 triangles per hand. 2048×2048 texture size
High quality normal map baked from a sculpt. Normal map is synched with Unity’s tangent basis
Simple skin shader with skin ramp included
Compatible with UFPS, or use it with your own first person system.