The Schiessbecher grenade launcher

Grenade launcher

A grenade launcher or grenade discharger is a weapon that launches a grenade with more accuracy, higher velocity, and to greater distances than a soldier could throw it by hand....

 used by German forces in World War 2 had a short rifled barrel with a caliber

Caliber

In guns including firearms, caliber or calibre is the approximate internal diameter of the barrel in relation to the diameter of the projectile used in it....

 of 30mm and a length of 25 cm. It weighed 0.75 kg and was attached to the bore of a rifle

Rifle

A rifle is a firearm designed to be fired from the shoulder, with a barrel that has a helical groove or pattern of grooves cut into the barrel walls. The raised areas of the rifling are called "lands," which make contact with the projectile , imparting spin around an axis corresponding to the...

 chambered for 7.92mm ammunition

Ammunition

Ammunition is a generic term derived from the French language la munition which embraced all material used for war , but which in time came to refer specifically to gunpowder and artillery. The collective term for all types of ammunition is munitions...

. A rather complicated aiming device was mounted to the left of the original sights and allowed for aiming ranges of up to 300m. the Schiessbecher was produced until May 1944, the total production was 1,450,114.