Tsunami Arms Helix (2020)

Tsunami Arms Helix is massive weapon is arguably one of the most devastating small arms for close-range house-to-house combat-a hex-barreled gatling shotgun which fires binary 10-gauge shells at 1300 rounds per minute! About one meter in length, the gun's six barrels are all a respectable 45cm long. The Helix has an inclined rear pistolgrip as well as a top-mounted fore-handle; it has no stock, since it was built to be fired "from the hip". To aid in aiming, there is a top-mounted laser-sighting system with adjustable pattern-matching capability. The Helix is constructed of high-tech composites and lightweight alloys, and weighs 15kg. Its projectiles consist of conventional 10-gauge slugs or packages of shot or flechettes stored in a synthetic canister. The ammo feed, centrally located beneath the tubular body of the gun, accepts either a belt feed or a box magazine which contains an ample supply of binary propellant and stores 60 projectiles; a rotor in the feed aligns the projectiles as it loads them. The weapon's binary propellant eliminates the bulk of a stabilizing element in its ammunition, and instead uses two gases which seperately are stable, but are volatile when injected together into the ignition chamber. The design of the Helix keeps the line of recoil low and in line with the grip to lessen muzzle climb on full auto, and the six barrels, all rotating around a central axis, have long, flared muzzles with four compensation ports each. This, combined with the weapon's recoil operation, allows for relatively controllable autofire. The sound made by the Helix is distinct: a heavy, metallic scream.

Source

 * Solo of Fortune 2, pg.67
 * Blackhand's Street Weapons, pg.38