They were making these for the Austrian and other NATO military before they came out with their pistol.
In other words they were a great company before they were gun company.
The grenade has a polymer body with steel ball bearings mixed into the explosive material providing the frag.
I was into 10mm Auto before it sold out and went mainstream, but these days I'm here for the revolver and epidemiology information.
They had enough humor to make the Glock 45 a 9mm. I think that making the Glock 44 a .22LR would be pretty cute. However, I don't think it'll happen because it's harder to achieve very high reliability with rimfires. I could see Glock worrying that a bad bucket of bulk .22 would tarnish Perfection.