Lego Weapons and Guns - Part 7 : Gatling Gun and Machine Gun (Tutorial) - YouTube
Amazon.com: Yanscian M416 Semi-Auto Nerf Rifle Gun Model Building Toy kit Set 629 Pcs DIY STEM Toy Machine Gun Weapon Building Block Brick Gun for Kids & Adults Compatible with Lego :
Minifigure Gun - US LMG
A quick machine gun MOC I made with a few spare parts : r/lego