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The FN Fire Control Unit (FN FCU) is an advanced sight designed for use with any 40mm stand-alone or underbarrel grenade launcher. Using the FN FCU maximizes first-round hit probability.
Two models are available: the FN FCU-850N and the FN FCU-1.5M. Both offer similar aiming/firing capabilities and benefits, with the FN FCU-1.5M featuring a laser range finder undetectable with Night Vision Goggles.
The FN FCU consists of:
- a laser range finder (LRF), which calculates the distance between the shooter and the target
- a clinometer, which measures the difference in elevation/depression between the target and the shooter
- a ballistic computer, which calculates the angle of launch required
- a moving red reticle sight, which gives the correct aiming point
- a weapon cant indicator, which indicates when weapon realignment is required.
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| Design |
The FCU is capable of ranging targets from 40m to 900m day and night. It contains an onboard Ballistic Computer (BC), for up to 50 different types of 40mm grenades; the ballistic solutions from the computer take into account and compensate for the initial vertical angle of the target. The FCU is operable by a remote trigger. If there is weapon cant, the red reticle flashes to indicate the operator needs to realign the weapon vertically. Red reticle flashes quickly or slowly if the operator needs to realign to the right or left respectively. The FN FCU is powered by two CR123 type batteries.
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| Combat use |
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Successful target engagement with 40mm LV tube-launched grenades requires precise range estimation to the target and launch at the exact elevation angle, while keeping correct azimuth aiming.
With the FN Fire Control Unit (FN FCU), the shooter can now rely on a light, compact and easily used device to significantly maximize first-round hit probability.
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| Main Benefits of FN FCUs |
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- Automatic aiming correction
- All human factors likely to affect accuracy are eliminated
- Maximized grenade launcher effectiveness
- Fast and accurate target engagement
- Highly ergonomic moving red reticle
- Weapon cant indicator
- Easy to use
- Lightweight and compact
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| Specifications |
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General Specifications
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- Two CR123-type 3-volt batteries as power source
- Remotely mounted pressure switch with ruggedized cord connection port
- Rear-facing LED display screen
- MIL SPEC membrane switches for power and reticle brightness
- Flashing reticle indicator allows operator to correct for left or right weapon cant
- Housing shape allows use of rifle’s optical and/or iron sights
- Adaptable to any rifle, carbine or grenade launcher with a top-mounted MIL-STD 1913 rail
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Moving Red Aiming Reticle Sight
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- .06 degree resolution
- .25 degree accuracy
- 40 degree maximum sighting angle provides 380 meters of effective grenade firing range (low velocity grenades only)
- windage and elevation/depression may be adjusted independently to co-witness with iron sights |
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Laser Range Finder
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- 900 meters effective range
- Range finder may be used independent of grenade launcher to range for more precise long-range rifle fire
- 850 nm wavelength (FN FCU-850N)
- 1550 nm wavelength (FN FCU-1.5M)
- Class 3b visible laser (FN FCU-850N)
- Class 1 (training) and Class 3b (combat) visible laser (FN FCU-1.5M)
- Class 1m infrared laser (FN FCU-850N)
- Class 1 (training) and Class 3b (combat) infrared laser (FN FCU-1.5M)
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Ballistic Computer
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- Instantly calculates firing solution for 50+ different types of 40x46mm grenades
- Built-in clinometer senses initial up/down sighting angle
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