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M7 Rifle Grenade Launcher: Difference between revisions
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The '''M7 Rifle Grenade Launcher''' (Remington T14 prior to adoption) was a muzzle device adopted by the US military in 1943 that could be attached to the [[M1 Garand]] in order to allow it to fire 22mm rifle grenades using blank propelling cartridges. It was developed to solve the challenge of firing rifle grenades from a gas-operated semi-automatic rifle: prior to this, the solution had been for squad grenadiers to be issued with a bolt-action rifle, either an [[M1903A3 Springfield]] equipped with an M1 Rifle Grenade Launcher or more rarely an [[M1917 Enfield]] equipped with an M2 Rifle Grenade Launcher. | The '''M7 Rifle Grenade Launcher''' (Remington T14 prior to adoption) was a muzzle device adopted by the US military in 1943 that could be attached to the [[M1 Garand]] in order to allow it to fire 22mm rifle grenades using blank propelling cartridges. It was developed to solve the challenge of firing rifle grenades from a gas-operated semi-automatic rifle: prior to this, the solution had been for squad grenadiers to be issued with a bolt-action rifle, either an [[M1903A3 Springfield]] equipped with an M1 Rifle Grenade Launcher or more rarely an [[M1917 Enfield]] equipped with an M2 Rifle Grenade Launcher. | ||
Fitting the original M7 turned the M1 Garand into a manually-operated repeater as long as it was mounted, since the assembly included a stud that depressed the valve of the rifle's gas cylinder lock screw to vent all of the gas that would normally cycle the action. This was intended to prevent serious damage to the gas system (original production M1 Garands with the B147428 solid lock screw do not have a hole large enough to even mount an M7, but those with reproduction solid screws that can fit an M5-series bayonet may explode if used with an M7), and prevent the rifle ejecting spent casings into the operator or trying to eat him when cycling next to his leg. Since this meant the launcher had to be constantly dismounted and re-mounted, they were frequently lost: period documents indicate that 15-20% of M7 launchers in inventory were being lost per month. In addition, it was not until January 1944 that the 7310079 "poppet" lock screw with a self-closing valve was standardised for the M1 Garand: prior to this, the user would have to fire off a round upon dismounting the M7 to close the B147851 lock screw valve via gas pressure. Only the postwar M7s, the M7A1 (1949), M7A2 (1951) and M7A3 (1953) allowed semi-automatic fire with the launcher mounted: these used the recoil from the grenade actually being launched to open the valve, and have pronounced ribs along their length rather than the indents of the wartime M7. | Fitting the original M7 turned the M1 Garand into a manually-operated repeater as long as it was mounted, since the assembly included a stud that depressed the valve of the rifle's gas cylinder lock screw to vent all of the gas that would normally cycle the action. This was intended to prevent serious damage to the gas system from the pressure of firing a 1.2 pound rifle grenade rather than a 0.02 pound bullet (original production M1 Garands with the B147428 solid lock screw do not have a hole large enough to even mount an M7, but those with reproduction solid screws that can fit an M5-series bayonet may explode if used with an M7), and prevent the rifle ejecting spent casings into the operator or trying to eat him when cycling next to his leg. Since this meant the launcher had to be constantly dismounted and re-mounted, they were frequently lost: period documents indicate that 15-20% of M7 launchers in inventory were being lost per month. In addition, it was not until January 1944 that the 7310079 "poppet" lock screw with a self-closing valve was standardised for the M1 Garand: prior to this, the user would have to fire off a round upon dismounting the M7 to close the B147851 lock screw valve via gas pressure. Only the postwar M7s, the M7A1 (1949), M7A2 (1951) and M7A3 (1953) allowed semi-automatic fire with the launcher mounted: these used the recoil from the grenade actually being launched to open the valve, and have pronounced ribs along their length rather than the indents of the wartime M7. | ||
It could accept several grenade types, but the most common were the [[M9A1 Rifle Grenade]] with a HEAT warhead, the M19 with a white phosphorous smoke / incendiary warhead, and the [[M17 Rifle Grenade]] with a fragmentation warhead. The latter was rendered obsolete when the M1 rifle grenade adapter was introduced in 1944, which could make any [[Mk 2 Hand Grenade]] (and later the [[M34 White Phosphorous grenade]]) capable of being fired from the M7 launcher, and could also be adapted to launch the warhead of a 60mm mortar shell. Since the 22mm rifle grenade socket size was standardised at the formation of NATO, the M7 can also launch many later grenade types such as the Mecar ENERGA anti-tank grenade, though due to issues of recoil force damaging the M7A1 and punching out the Garand's gas valve when used with the M7A2, this particular round was quickly limited to the M7A3. | It could accept several grenade types, but the most common were the [[M9A1 Rifle Grenade]] with a HEAT warhead, the M19 with a white phosphorous smoke / incendiary warhead, and the [[M17 Rifle Grenade]] with a fragmentation warhead. The latter was rendered obsolete when the M1 rifle grenade adapter was introduced in 1944, which could make any [[Mk 2 Hand Grenade]] (and later the [[M34 White Phosphorous grenade]]) capable of being fired from the M7 launcher, and could also be adapted to launch the warhead of a 60mm mortar shell. Since the 22mm rifle grenade socket size was standardised at the formation of NATO, the M7 can also launch many later grenade types such as the Mecar ENERGA anti-tank grenade, though due to issues of recoil force damaging the M7A1 and punching out the Garand's gas valve when used with the M7A2, this particular round was quickly limited to the M7A3. | ||
Revision as of 12:18, 20 November 2017
The M7 Rifle Grenade Launcher (Remington T14 prior to adoption) was a muzzle device adopted by the US military in 1943 that could be attached to the M1 Garand in order to allow it to fire 22mm rifle grenades using blank propelling cartridges. It was developed to solve the challenge of firing rifle grenades from a gas-operated semi-automatic rifle: prior to this, the solution had been for squad grenadiers to be issued with a bolt-action rifle, either an M1903A3 Springfield equipped with an M1 Rifle Grenade Launcher or more rarely an M1917 Enfield equipped with an M2 Rifle Grenade Launcher.
Fitting the original M7 turned the M1 Garand into a manually-operated repeater as long as it was mounted, since the assembly included a stud that depressed the valve of the rifle's gas cylinder lock screw to vent all of the gas that would normally cycle the action. This was intended to prevent serious damage to the gas system from the pressure of firing a 1.2 pound rifle grenade rather than a 0.02 pound bullet (original production M1 Garands with the B147428 solid lock screw do not have a hole large enough to even mount an M7, but those with reproduction solid screws that can fit an M5-series bayonet may explode if used with an M7), and prevent the rifle ejecting spent casings into the operator or trying to eat him when cycling next to his leg. Since this meant the launcher had to be constantly dismounted and re-mounted, they were frequently lost: period documents indicate that 15-20% of M7 launchers in inventory were being lost per month. In addition, it was not until January 1944 that the 7310079 "poppet" lock screw with a self-closing valve was standardised for the M1 Garand: prior to this, the user would have to fire off a round upon dismounting the M7 to close the B147851 lock screw valve via gas pressure. Only the postwar M7s, the M7A1 (1949), M7A2 (1951) and M7A3 (1953) allowed semi-automatic fire with the launcher mounted: these used the recoil from the grenade actually being launched to open the valve, and have pronounced ribs along their length rather than the indents of the wartime M7.
It could accept several grenade types, but the most common were the M9A1 Rifle Grenade with a HEAT warhead, the M19 with a white phosphorous smoke / incendiary warhead, and the M17 Rifle Grenade with a fragmentation warhead. The latter was rendered obsolete when the M1 rifle grenade adapter was introduced in 1944, which could make any Mk 2 Hand Grenade (and later the M34 White Phosphorous grenade) capable of being fired from the M7 launcher, and could also be adapted to launch the warhead of a 60mm mortar shell. Since the 22mm rifle grenade socket size was standardised at the formation of NATO, the M7 can also launch many later grenade types such as the Mecar ENERGA anti-tank grenade, though due to issues of recoil force damaging the M7A1 and punching out the Garand's gas valve when used with the M7A2, this particular round was quickly limited to the M7A3.
The pin needs to be pulled from the grenade before the M1 rifle grenade adapter is fired, something often forgotten in media depictions. The adapter then retains the grenade's spoon with an arming clip that separates due to inertia on launch: assembled M1 rifle grenades often had a block of wood under the spoon to hold the clip securely during transport.
While it is often thought that firing the M7 required the stock of the rifle to be rested on the ground, this is not strictly true: soldiers were taught two firing positions, one the aforementioned position aiming the rifle like a mortar, the second to hold the rifle with the stock under their arm for more direct fire. Shouldering the rifle when firing is not correct, however, since the recoil was as powerful as one would expect from launching such a large projectile.
The M8 Rifle Grenade Launcher is a variant of the M7, used with the M1 Carbine.
The M7 Rifle Grenade Launcher and variants can be seen in the following films, television series, video games, and anime used by the following actors:
Specifications
(1943-1959)
- Type: Rifle grenade adapter
- Caliber: 22mm (external), .30-06 (internal)
- Weight: 0.8 lbs (0.3 kg) (M7)
- Length: Overall length 7.5 in (19.1 cm) (M7), 9 in (22.9 cm) (M7A3)
- Feed System: Muzzle-loaded, grenade blanks provided in en-bloc clips
- Fire Modes: Single shot
Film
| Title | Actor | Character | Note | Date |
|---|---|---|---|---|
| The Beast from 20,000 Fathoms | Lee Van Cleef | Corp. Stone | M8 launcher on M1 Carbine | 1953 |
| Reptilicus | A Danish soldier | 1961 | ||
| Merrill's Marauders | U.S. Army soldiers | 1962 | ||
| Battle of the Bulge | George Montgomery | Sgt. Duquesne | 1965 | |
| Saving Private Ryan | US Army soldier | 1998 | ||
| Flags of Our Fathers | Joseph Cross | PFC Franklin Sousey | 2006 | |
| The Front Line | South Korean Army | 2011 | ||
| Saints and Soldiers: Airborne Creed | Jasen Wade | Corporal Curtis | 2012 |
Television
| Actor | Character | Show Title / Episode | Note | Air Date |
|---|---|---|---|---|
| Adam James | Pvt. Cleveland Petty | Band of Brothers / "Carentan" | 2001 | |
| Cpl. Schmidt | Band of Brothers | 2001 | ||
| Dexter Fletcher | Sgt. Johnny Martin | Band of Brothers / "The Last Patrol" | 2001 | |
| US Marines | The Pacific | 2010 |
Video Games
| Game Title | Appears as | Mods | Notation | Release Date |
|---|---|---|---|---|
| Day of Defeat: Source | 2005 | |||
| Medal of Honor: Airborne | 2007 | |||
| Call of Duty: World at War | 2008 | |||
| Project Reality: Normandy | 2013 |