Realistic Shoulder Machine Gun Prop

I'm looking for a highly realistic shoulder machine gun prop for a low-budget film production. The gun needs to have moving parts, including:

- Barrel rotation
- Rear bullet dispenser
- Gun unit movement left to right

The prop should be intricately detailed to ensure it looks authentic on camera. Ideal skills and experience include:

- Expertise in prop design and fabrication
- Experience with mechanical moving parts
- Strong attention to detail and realism in prop creation

Please provide samples of previous work.