Well, they may be cool, but I fear the more feasible these weapons get, the more the left may win over the less politically-aware people by saying “look, you don’t even need firearms to go hunting anymore!”
The trouble is finding ammo, what good does a gun do if you cant get ammo for it.
I remember reading that one of the weapons carried by the Lewis and Clark expedition was an air rifle used to harvest game.
I have an air rifle, .117 cal, that could kill a person with the right shot.
I used to practice shooting it behind my parents house in VT. I could shoot a quarter out of target at 25 yards. More than enough to shoot critters.