Download Rebels FREE Unity. 

The pack includes 24 assembled characters,50 PBR materials for customization, 9 body parts and gun. Skinned model and MotionBuilder/Unity Mecanim compatible skeleton. have WeaponHolder bone for weapon attachment. The assembled character contains 12 – 14 thousand polygons on average.

Check out the details from the Unity Asset Store: https://assetstore.unity.com/packages/3d/characters/rebels-77626