A coilgun that size isn't going to be making anything supersonic. I would be genuinely surprised if it even matched the force of something like an airsoft gun.

Honestly this thing looks like a hobbyist toy more than a weapon. Like it might pose a risk of eye injury if fired towards someone, but I wouldn't expect it to even break skin at close range. Unless it's got some absurdly strong capacitor bank powering it and is very well designed it's just not going to put out much force at all. At that scale a railgun might honestly be a better bet for "an at least somewhat dangerous handheld electric projectile launcher", because the problems with those (the surface of the rails oxidizing after a shot or two, so they stop making a good connection with the round and can't fire) only start cropping up when you get to really high velocities and higher power flow.