Repairing a NERF Vigilon

Santa brought the kids some NERF disc launchers for Christmas, and it appears that we received one made by one of his less competent elves.  The outside appearance was fine, however the trigger wouldn't budge.  We went through the steps in the instructions to clear a jam (although nothing was in there to be jammed, it was a new toy), but it ultimately had no effect.

After going through the normal set of engineering diagnosis steps (tapping the gun against the palm of my hand, pounding it on the floor, cursing, etc.), I decided to disassemble it and see if a repair was possible.  Once the outer shell was removed, it was fairly apparent that something was blocking the trigger mechanism.

I have no idea what the underlying problem was, but suspect that the assembly was missing some springs that were meant to keep the tabs in a lowered position.  I had no confidence that I'd be able to reassemble the internal shooting assembly if I took that apart (odds are that some little plastic part would break), so I instead decided to remove the offending plastic cylinders with a hacksaw.

After the tabs were removed, the trigger moved normally.  I reassembled the NERF disc launcher and everything appears to be work properly now.