Non-firearms guy reading, was just looking at muzzle velocity, ~245fps (75m/s), where a .45ACP round goes ~500fps. - but joules would be the way to compare the physics. In terms of energy/silence, for hunting, it seems like you can buy more powerful crossbows at a camping store. Additional energy just seems like an optimization problem that could be solved with an external power pack source.

However, the real game changer may be in the economics of EMP shielding and weapons, where if all legal civilian firearms are electronic, they are also remotely manageable via DRM and less user servicable. The analogy could be like what electronic fuel injection did to carbeurators and the autonomy of drivers to service their own vehicles.

This rifle seems like a bit of a gimmick, but from a political perspective I could see some people saying, "let them hunt with coilguns, nobody needs gunpowder anymore," which will be a new leverage point on 2A limitations whereby this product is a managed substitute. Independent of where one stands on that issue, the product is a technology that could change the dynamic of that discussion.

More context:

"The GR-1 is capable of accepting 3 different standard projectile lengths (32 mm, 42 mm, and 52 mm) with a unique variable magazine system"

"Muzzle Velocity: 75 m/s."

75 m/s is slower than a lot of bows, and those are fairly big slugs, as compared to a .22 bullet.

What you should expect with this gun is a very curved trajectory and, likely, low accuracy. At the very least, it will need sights similar to what's available for bows, since a few meters of distance in range will have a large impact on where the bullet lands.

The large size of these bullets means they might actually not penetrate much, if at all. (I'd appreciate more spec's than just their length). Yes, they have half the kinetic energy of a .22 round, but that's going to be spread over a much larger impact area.

Another comparison: the ballsiest Airsoft limit I know is set by Poland to 17 Joules, with something like Frances 2J at the other end of the spectrum.

However the Joules are tunable. You can dial up and down, I believe.