I released this robot character on the Epic Marketplace awhile ago.

It features:

• Modular frame with attachable parts.
• Customizable materials.
• Third person template - character and animation blueprint.
• Morph targets for camera shutters (optional: skeletal mesh without morph targets).
• Rifle, magazine, cartridges and iron sights included.

https://www.unrealengine.com/marketplace/en-US/product/robot-rifleman