Royal Enfield Ordnance Liquid Propellant Assault Rifle LPA1

Royal Enfield Ordnance Liquid Propellant Assault Rifle LPA1 is a twin-magazine, liquid-propellant, variable-velocity assault rifle. Designed as a multi-role small arms weapon system, it is now entering limited test service with the BCF. The LPA 1 is laid out in the traditional bullpup configuration with the liquid propellant stored in a self-sealing armored cassette in the butt The twin helical magazines are situated on either side of the receiver. Each magazine holds 45 rounds, giving the rifle an immense 90-round ammo supply. With dual magazines it is possible to carry mixed ammo types. The LPA 1 can use most ammo options and can support rifle-fired grenades with a small muzzle modification. The rifle comes with three velocity settings, which can be selected either manually or by neural interface for smartchipped versions. The settings are 1) Low-riot/2D6+ 1, 2) Medium-urban/4D6, and 3) High-full combat/6D6. Because of the high recoil on full velocity, a hydro-pneumatic recoil damper was built into the rifle. The liquid propellant (a derivative of ESA shuttle fuel) is injected into the breech under computer control. The amount injected depends on the velocity setting and range of the target This information comes from the integral Marconi SUSAT cyberoptic sight situated on top of the receiver.

Source

 * Rough Guide to the UK, pg.34
 * Blackhand's Street Weapons, pg.29