Replacement gear for Nerf Slingfire. Tested and working.
Hasbro uses wierd type of gears - this one is a modified spur gear, square hole is tilted, to fit the original ones shape.
Square hole may need some square needle file work to fit shaft properly.
WARING! Find any photo on the Web including proper positioning of the original gears.
Use it as a reference - this tilted sqare shaft hole is for a reason, bad positioning may cause mechanism to not work at all.