A plastic pistol shaped toy dart gun having a barrel with a non-circular muzzle opening for a suction cup ended dart shaft having a cooperating cross section with that opening; which barrel houses a helical compressible dart ejecting spring and has extending along the side of the barrel, the longer leg of an L-shaped trigger pivoted centrally of this leg. This trigger has a hook at the outer end of this longer leg for engaging a notch in the shaft of the dart for cocking the gun, and at the inner end of the longer leg a spring side engagable portion for insuring engagement of the hook when the proper dart is properly inserted into the gun. The barrel also contains opposite this spring engagable portion on the trigger, a spring deflector cam to urge the compressed spring against this engagable portion of the trigger for further insuring engagement of the hook into the notch in the dart's shaft for cocking the gun.