This grenade was launched with the M1 carbine, but instead of a steel rod, it was launched using the special attachment.
Shown below is the first model, the 2nd had a rounded top, see bottom of page.

Data for the "Live teargas" types (3):
Length: 170mm , Diameter: 36mm.
Total weight: 138gr.
CN or CS filling: 2,4gram, 7gram or 12gram.
Fuze delay: 1,5 sec. Gas emission: 17 sec.
Launching distance: 50 - 230meter.
Manufactured by Dynamit Nobel AG, Troisdorf

All photos and data © M. Jochoms.

The photos below show the second type, having a different tail section.

Rifle attachment :