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The M7 grenade launcher, formally rifle grenade launcher, M7, was a 22 mm rifle grenade launcher attachment for the M1 Garand rifle that saw widespread use throughout World War II and the Korean War. The M7 was a tube-shaped device, with one end slotting over the muzzle of the rifle and attaching to the bayonet mount, and the other end holding ...
Ordnance crest "WHAT'S IN A NAME" - military education about SNL. This is a historic (index) list of United States Army weapons and materiel, by their Standard Nomenclature List (SNL) group and individual designations — an alpha-numeric nomenclature system used in the United States Army Ordnance Corps Supply Catalogues used from about 1930 to about 1958.
In the years just before World War II, the United States adopted the spigot-type 22 mm rifle grenade launchers. These 22 mm (0.87 in) launchers are attached to a rifles muzzle, in the form of a detachable adapter. As with most rifle grenades, it is propelled by a blank cartridge inserted into the chamber of the rifle.
It consisted of an add-on 22 mm (0.87 in) stabilizer tube and fins that converted a hand-grenade into a rifle grenade. It supplanted the M17 rifle grenade, and was eventually made obsolete by the 40 mm M79 grenade launcher. [1] (From left to right): M1 grenade adapter with Mk.2 fragmentation grenade, M22 smoke rifle grenade with impact fuze ...
Thus, a 22 mm rifle grenade can easily be as powerful as a 40 mm grenade, in spite of the seemingly smaller size. A 22 mm grenade is launched on the spigot principle, like a spigot mortar ; a tube slightly under 22 mm is attached to the end of a rifle barrel to serve as the spigot, and left open on the muzzle end so bullets can be fired through it.
M9 rifle grenade being launched from an M1 Garand. The M9 rifle grenade was an American anti-tank rifle grenade used during World War II. The earlier-designed M10 grenade was too heavy to be fired an effective distance by a rifle; the M9 was conceived as a lighter version of that design. (The M10 became part of the evolution of the bazooka.)
Once the warhead is screwed in, the M17 is fitted onto a grenade launcher adapter, such as the M7 grenade launcher. A special blank .30-06 cartridge is inserted into the rifle, then fired. The M17 will not explode if it lands on sand, water or mud; only solid ground will cause it to detonate.
When the rifle is fired the flash from the blank cartridge enters a hole in the base of the grenade which starts both a friction igniter and a time fuze. The grenade will then detonate on contact by the impact fuze, detonate after 4.5 seconds by the friction igniter or detonate after another 6.5 seconds by a time fuze for a total of 11 seconds.