Chosen Solution

The darts will not sit all the way in the chamber. They will slide out about a 1/2 in, this not fire correctly

nerf guns are picky about their ammo sometimes, that gun in particular is really picky, darts from HB or Walmart nock-offs have slightly different inner diameter then Nerfs….. also kids chewing on them doesnt help in my experience. . my kids will eat anything..

So as its not going in fully i taped some paper to the dart shown in the below picture and it worked cause it was loose