• What for?

    Optimizing first round hit probability when using a 40mm LV/MV grenade system

  • For whom?

    Users of 40mm grenades

  • FN solution?

    FN® FCU Mk3 Fire Control Unit


  • FAQ

Key Benefits

  • Hit first time, on target, night and day
  • No external moving parts
  • Accurate and fast target engagement
  • Automatic adjustment of the reticle
  • Automatic lateral drift compensation
  • Lightweight, ergonomic, easy to use
  • Quickly detachable
  • Quick and easy transition between different types of grenades
  • Compatible with any rifle, grenade launcher or multi-shot grenade launcher
  • Comes standard with specific features to ensure safe training
  • Suitable for extreme conditions (-32°C to +65°C, IP68, water, sand, mud)
  • ITAR-free

FN® FCU Mk3 Fire Control Unit

FN Herstal’s newly upgraded FN® FCU Mk3 Fire Control Unit features a high performance optoelectronic aiming system that vastly improves first round hit probability – night and day. It combines over 15 years of FN experience in the design and manufacture of Fire Control Units with user feedback and the latest generation of integrated electronic modules.

Key Features

Length 129mm (5")
Width 97mm (3.81")
Height 75mm (2.95") above rail
~ 580 g (~ 1.27 lb) without batteries
1 x CR123
Laser range finder
30 - 1,000m (up to 2,500m on request)
Laser beam 1,500nm
Eye safety Class 1
Visible/infrared laser pointers
Training Class 1
Combat Class 3B (available by using a separate specific operations switch)


February 16, 2022

Special Forces from a European country adopt the FN® FCU Mk3 Fire Control Unit to equip 40mm Multi-Shot Grenade Launchers

May 15, 2019

FN® FCU Mk3 Fire Control Unit for 40mm Grenades on display at SOFIC 2019

January 13, 2019

FN Herstal Releases its Next Generation FN® FCU to Enhance Hit Probability of 40mm Grenade System

January 13, 2019

FN Herstal’s Fire Control Unit: Part of the Infanterist der Zukunft-Erweitertes System (IdZ-ES) for the German Army


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    All products marketed by FN HERSTAL, S.A., Belgium, are restricted to military, law enforcement, security and special forces sales only, and are subject to export licenses/permits by competent Authorities. The information contained on this website and/or requested through this website is therefore targeting only and exclusively an informed and seasoned specific professional audience. By simply requesting a brochure, you expressly and irrevocably recognize that you are a professional and part of a military, law enforcement or special forces group expressly targeted by the present website and brochure. FN HERSTAL, S.A. shall therefore not be held liable for any misuse of the website/brochure or whatsoever.


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