FN Unveils Lightweight .50 Cal Door Gun System

FN Herstal, a global leader in airborne weapon systems, is set to debut a new lightweight variant of its .50 caliber crew-served weapon system at the 2025 Paris Air Show. Built with advanced composite materials, the redesigned system offers a significant 40% weight reduction compared to previous models, without sacrificing the performance and reliability that FN is known for.

The update focuses on FN’s Medium Door Pintle Turning System (FN MDP Turning), which mounts the battle-proven .50 cal FN M3M machine gun. Designed with versatility in mind, the MDP Turning setup allows crews to quickly retract or remove the weapon when not in use, offering a flexible solution for rotary-wing platforms where space and payload matter.

FN Herstal @ TFB:

• FN Herstal's Finnish Subsidiary Noptel Expands its Manufacturing Capacity
• German Door Gunners Get More FN Herstal M3M MK3 Heavy Machine Guns
• FN Partners With Dillon Aero For Modular Aircraft Gun Mountings

One of the key innovations lies in the mounting system. Traditionally, the weapon is secured using a machined aluminum base plate connected to existing hardpoints on the aircraft. FN has now developed a composite replacement for that plate, cutting weight while still meeting stringent MIL-STD-810G environmental standards and 20G crash safety requirements.

With serial production already underway and multiple integration projects in progress (both with OEMs and direct end users), FN’s new lightweight solution is ready for prime time in the air. It will be on display at the Paris Air Show from June 16–22, 2025, at FN’s stand (G51, Hall 2B).

For operators where every kilogram counts, especially on helicopters, this lighter setup opens the door to more fuel, ammunition, or mission-critical gear on board - without compromising any firepower.

If you want to see the FN M3M machine gun in action have a look here Aerial Door gunner in Ubung Heli Dust – FN M3M (GAU-21) or here M3M Door Gunner in the NHIndustries NH90.