Automatic grenade launchers have become one of the staples in the armory of the present time, with a perfect blend of firepower of a heavy caliber, versatility, and quick engagement capability. Being among the most famous examples, the Mk 19 and its follow-up, the Mk 47 Striker, serve as models for the changing requirements of the battles to impact gun design.
The development of the Mk 19 started in the last years of the Vietnam War, when the US military was seeking a weapon capable of delivering intense bursts of explosive firepower—especially for use on river patrols and mounted vehicles. Manufactured by Saco Defense Industries, the Mk 19 entered service in 1968 and earned a reputation as a hardy, belt-fed, blowback-operated, air-cooled workhorse. It could shoot both single shots and in full-auto, being chambered for the powerful 40 mm grenade. Its open-bolt action, together with its ruggedness, saw it being installed in everything from patrol boats to Humvees, Strykers, and ship mounts.
Even today, its numbers are enormous. The Mk 19 tips the scales at 77.6 pounds and is usually crew-mounted, the most frequent being vehicle-mounted due to its weight. Firing 40×53 mm high-velocity grenades, it has a cyclic rate of 325–375 rounds per minute, with realistic sustained firing rates of 40–60 rounds per minute.
It can effectively engage point targets to 1,500 meters, and up to 2,212 meters for area suppression. Its main mission—the M430 dual-purpose high-explosive round—is lethal within a five-meter radius and can penetrate up to 50 mm of rolled homogeneous armor, giving it punch against light armor and hardened positions.
The rounds come in 32- or 48-round disintegrating link belts, whose cans range from 42–60 pounds. Low recoil and elastic mounts enabled it to proliferate in U.S. and allied troops, with over 35,000 made and utilized in the Vietnam War, until Iraq and Afghanistan. Its success even inspired similar designs like the AGS-17 and Heckler & Koch GMG.
Firearm training with the gun is made possible with tools such as the XM922 High-Velocity Dummy Round, which is equal in weight and size to live rounds but is inert—ideal for loading exercises, handling practice, and malfunction drills without the risks associated with live fire.
However, by the early 2000s, it was clear that the Mk 19’s design was getting old. New battlefield scenarios called for a lighter, more precise platform that could be teamed with advanced optics and smart ammunition. The answer came in the Mk 47 Striker. Ordered to General Dynamics in 2006 and built in Saco, Maine, featuring a Raytheon fire control, the Mk 47 represented a quantum leap in capability.
The Striker comes in at only 39.6 pounds for the launcher alone—half of the Mk 19’s weight—and with its mount and tripod tips the scales at around 90 pounds. It uses a closed-bolt firing mechanism, necessary to fire programmable grenades with the correct timing of the detonation. The Striker’s precision is made possible by the Raytheon AN/PVG-1 Lightweight Video Sight, which combines a ballistic computer, laser rangefinder, and 9x zoom, enabling soldiers to fire accurately at long ranges.
One of the greatest advances in lethality is its ability to use programmable prefragmented high-explosive (PPHE) rounds with airburst detonation. This means grenades can be programmed to explode over or behind enemy fortifications, making dug-in positions much less safe. With a range of 1,700 meters and a rate of fire of about 60 rounds per minute, the Mk 47 can fire an incredibly diverse selection of ammunition—from training rounds like the M385 and M918 to ammunition like the Mk 285.
Originally used by the U.S. Special Operations Command, the Mk 47 has also been used in Iraq, Afghanistan, and Syria, and embraced by allied nations’ forces seeking to modernize their arsenals. It is designed with accuracy, versatility, and keeping up with the times for decades to come.
The shift from the Mk 19 to the Mk 47 is not a tale of two guns—it’s a reflection of how military tech evolves. With threats more advanced and precision translating to raw firepower, automatic grenade launchers have adapted in response to stay ahead of the game, continuing to be an essential element of combat.