Finish your 40mm L/70 Bofors display round with this newly manufactured dummy nose fuze. Purpose-built for the M811 High Explosive Incendiary, Point Detonating (HEI-PD) projectile, the U.S. 40×365mmR round was developed for the Bofors 40mm L/70 autocannon and the M247 Sergeant York DIVAD system.
Machined from solid aluminum, this dummy fuze replicates the external form and thread interface of the original M761-series point-detonating fuze used on the M811 cartridge, giving your inert projectiles the correct nose profile and finished, service-ready look.
Historical Background – M811 HEI-PD for the Bofors 40mm L/70
The Bofors 40mm L/70 is a post–World War II evolution of the famous 40mm L/60 anti-aircraft gun. Developed in the late 1940s, the L/70 offered higher muzzle velocity, a faster rate of fire, and improved performance against modern high-speed aircraft and lightly armored targets, and it went on to serve worldwide on ground mounts, armored vehicles, and naval platforms.
To support this gun in U.S. service, the Cartridge, 40mm HEI, M811 was adopted. It is a 40×365mmR high explosive incendiary round with a point-detonating fuze, filled with a high-energy explosive (Octol) and designed for use against low-flying aircraft and ground targets. The projectile body is alloy steel, painted yellow with black markings and a red band, and its nose is threaded to accept the M761/M761D point-detonating fuze, which provides graze sensitivity, delay action, and a self-destruct function for safety.
In the late 1970s and early 1980s, the M811 HEI-PD was notably associated with the M247 Sergeant York self-propelled anti-aircraft gun, a DIVAD system mounting twin 40mm L/70 guns on an M48 chassis, where M811 provided the primary high-explosive air-defense and ground-attack capability.
This listing is for the dummy nose fuze only; projectile is not included.
About This Dummy Nose Fuze
- Purpose-Built for M811 HEI-PD Projectiles
-
- Designed around the dimensions and thread pattern of the original M761-series point-detonating fuze used on the M811 cartridge.
- Intended to screw into the nose of 40mm L/70 M811 HEI-PD projectiles to complete inert or restored display rounds.
- High-Quality Aluminum Construction
-
- Machined from solid aluminum, offering excellent corrosion resistance and a clean, sharp profile.
- Ideal for polishing, painting, or marking to match your chosen M811 color pattern and stenciling.
- Correct External Profile for Authentic Displays
-
- Captures the overall contour, shoulder transitions, and ogive of the live-service fuze, ensuring your M811 display looks “ready for the clip.”
- Perfect for restored 40mm L/70 rounds, Sgt. York–themed displays, or general Cold War air-defense collections.
- Inert, Non-Functional Component
-
- No explosive, detonator, delay element, or self-destruct components.
- Sold strictly as an inert dummy fuze body for display and restoration work.
Compatibility & Use
- Intended specifically for:
-
- 40mm L/70 Bofors M811 HEI-PD projectiles (40×365mmR)
- Suitable applications:
-
- Completing restored 40mm M811 HEI-PD projectiles or complete inert rounds
- Replacing missing or damaged dummy fuzes on existing display rounds.
- Museum, reference, or training pieces illustrating modern 40mm L/70 ammunition
Ideal For
- Restoring 40mm L/70 Bofors M811 HEI-PD display rounds
- Building accurate M247 Sgt York ammunition displays
- Museum and educational exhibits on Cold War air defense and automatic cannon ammunition
- Collectors who have original M811 projectiles missing their nose elements
Approx length 2", Approx width 1", Approx height 1", Approx weight .1lbs.
Pictures are stock images of our inventory. Unless otherwise noted, you will not be receiving the exact item shown in the pictures. The pictures are representative of the item's general condition. The item you receive might be slightly better, or worse, condition than was shown in the pictures.
Please visit our page about order lead times here: Order Lead Times
