FYI....The jacketed .22 rim fire technology has been around for a while. The US Army was required to use it by the Geneva Convention, when it utilized .22cal weapons such as the " Hush Puppy"....
The Hush Puppy was a 9mm pistol, not .22.
It was a silenced version of a Smith and Wesson model 39.
Yes, but the high standard wasn't called the 'hush puppy'.