The Dual Cycle Rifle was a 5.56x45mm NATO calibre revolver-type assault rifle that used a unique gas operation with a Webley-Fosbery

Webley-Fosbery Automatic Revolver

The Webley-Fosbery Self-Cocking Automatic Revolver was an unusual, recoil-operated, automatic revolver designed by Lieutenant Colonel George Vincent Fosbery, VC and produced by the Webley and Scott company from 1901 to 1915...

-type grooved cylinder enabling 3-round bursts capable of firing 4,900 rounds per minute.

Overview

The Dual Cycle Rifle used a mechanism that would fire from a single barrel a full-auto three round burst at approximately 4,900 rounds per minute, assisted by a revolver-type cylinder with 3 round chambers on half of its side. The rifle mechanism used a cam and follower mechanism. The cam path controlled the basic function of the rifle action to obtain the highest rate of fire with minimum operating rod velocities and provided the ability to fire the three-round bursts. The three rounds were loaded simultaneously into a chamber and the chamber indexed to fire out each round before extraction. This removed the need for a full stroke cartridge handling mechanism.