My 3 years kid insisted to have a foam gun, so I bought 2 Nerf Maveriks (one for him, and one for me :)
NOTE: My Wife was not happy at all.
The problem was that my son found that to arm the gun (before each firing) was pretty hard
so I tried te soften the process
I replaced the original Spring by a simple rubber elestic, the hard thing was to find the right equilibrium between soft arming and power firing (must test a lot before finding it) but now it works!!
the foams do not go far, but it's easier and safer this way :)