This may sound stupid, but how do you practice with something like the Rage...or any other expandable for that matter. What I mean is this...with my Muzzy fixed blades I use spare blades that have already been shot as my practice blades and then all I have to do is switch out and put in new blades. But with Rage are the blades "changeable"? I did not think that they were and therefor you'd have to pretty much sacrifice one or more for practice purposes. Those dudes are pretty darn expensive to do that.