The design of this gun is flawed. The lever which arms the discs gets stuck easily and then there's little you can do but pray that it won't brake as you push and pull it around trying to unstuck it. Moreover, to arm the discs requires a bit of precision (how much you should extend the arm and how fast you should pull it back) which might be a problem for younger kids. Even I struggled with this from time to time. I don't know why Nerf chose to differentiate this gun from all the others but it doesn't work as it should.
I was this close to return this product because as soon as I unpacked it, the arm got stuck and almost broke it in an effort to unstuck it. Thankfully it didn't and as soon as you learn how to properly arm the gun, you can fire all 10 discs pretty fast and to a rather long distance I might say. But I don't think many people will be happy with the quality of this product..