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Weapon Bone

To fully integrate tactical animations with your animator controller, it’s essential to add a Tactical Weapon Bone component to your character:

Add this component to your character model (same as Animator).

This component will correctly position the weapon relative to the right hand at runtime. If you use a custom model with retargeted animations, assign your custom IK bones here (for more see Integrating Animations). Parent your guns to the ik_hand_gun (or a weapon bone):

Attach weapons to this bone.

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Avatar Mask

Now we need to create an Avatar Mask that will affect our upper body and IK bones. Right-click and choose Create ▸Animation ▸ Avatar Mask. Then, choose your avatar and select the upper body bones:

Select spine, neck and arm bones.

Next, check the weapon bone and IK bones for hands:

Select these bones.

Tip: Weapon bone and hand IKs are important for correctly positioning the weapon.

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Animator Controller

Create a new or use an existing layer for playing actions (e.g., reloads, mag checks, inspects, etc.), and assign the new upper body mask:

Assign the new mask here.

Finally, add animation clips to this layer:

Add clips, blend trees and transitions to fit the needs of your gameplay.

To play animations from code, use Unity-provided API:

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Spine Stabilization

By default, the lower-body locomotion will always affect the upper body. This makes the first-person view unstable when moving around.
To fix this issue, go to the Tactical Procedural Animation component and set the Spine Stabilization to 1:
Tip: This field is public, meaning you can update it dynamically in code.