P90: FN's Bullpup PDW

Published on August 31, 2025
Duration: 1:00

This guide details the disassembly and operational mechanics of the FN P90, as explained by Ian McCollum of Forgotten Weapons. It covers the simple blowback action, the unique rotary magazine feeding system, ambidextrous controls, and the bottom-ejection port. The P90's design emphasizes a compact, lightweight platform for its intended role as a Personal Defense Weapon.

Quick Summary

The FN P90 is a bullpup Personal Defense Weapon (PDW) utilizing a simple blowback action and an innovative rotary magazine that rotates cartridges 90 degrees for feeding. Chambered in 5.7x28mm, its design prioritizes a compact size and the ability to penetrate body armor, featuring ambidextrous controls and bottom-ejecting casings.

Chapters

  1. 00:00Introduction to the P90 PDW
  2. 00:19Magazine and Feeding Mechanism
  3. 00:35Controls and Ergonomics
  4. 00:49Internal Mechanics

Frequently Asked Questions

What makes the FN P90's magazine unique?

The FN P90 uses a distinctive rotary turntable mechanism within its translucent magazine. This mechanism rotates each 5.7x28mm cartridge 90 degrees to align it with the barrel for proper chambering during feeding.

How does the FN P90 operate mechanically?

The P90 operates on a simple blowback system, relying on the mass of the bolt to keep the action locked. It also features an internal anti-bounce weight to counteract bolt bounce during automatic fire.

What are the key ergonomic features of the FN P90?

The P90 is designed with ambidextrous controls, ensuring ease of use for both left and right-handed shooters. It also features bottom-ejecting spent casings, further enhancing its ambidextrous functionality.

What is the intended purpose of the FN P90 and its cartridge?

The P90 was developed as a Personal Defense Weapon (PDW) chambered in 5.7x28mm. The cartridge's small-diameter, high-velocity projectile is designed to penetrate body armor effectively.

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