Build a technic stock for a nerf gun I own. It can fold, and I managed to make it almost unbreakable. Sadly the stock was so strong it broke the back part
LEGO NERF GUN?? - WOW!! - YouTube
Build your own working LEGO Nerf gun!
Modeltronic Rifle Garand Usa M1 Of 583 Blocks Of Technic Blocks With Compatible Projectile Shooting Nerf - Interconnecting Blocks - AliExpress