Notes: This is a Mossberg M-590 redone by the M2 Corporation to make it better for tactical situations. The modifications include: a flat non-reflective finish; ghost ring rear sight and H&K-style front sight; muzzle and barrel reinforcement so that the shotgun can double as a battering ram (the tubular magazine is likewise reinforced, extended, and even with the muzzle); replacement of the pistol grip with one that is more ergonomic; a lighter trigger, and a "Sidesaddle" ammunition carrier holding 6 rounds.

Twilight 2000 Notes: This weapon does not exist.

Notes: This World War 1 weapon was designed for close-in trench fighting – hence the name. It is basically a Winchester 97 pump-action shotgun with a bayonet lug attached and a perforated heat shield above the barrel to facilitate bayonet fighting. They are not seen much today, but other weapons of this type have been made in other parts of the world. The most common place the Trench Gun is seen today is in the hands of World War 1 and 2 re-enactors.

Notes: As far as I know, this weapon is a "one-off" – a custom conversion done for firearms expert Paul Markel by Fit 4 Duty. It is an interesting gun, however, so I have included it here. Markel’s conversion centers around the use of Aguila’s Mini-Shells, 1.75"-long 12 Gauge shotgun shells. The shotgun has Tritium Big Dot/Ghost Ring XS sights, which are high-visibility and useful for throwing shot or slugs. The shotgun is finished in Fit 4 Duty’s OD Green anticorrosive coating. The standard stock is replaced with an Advanced Technology synthetic stock with a full pistol grip. A Wilderness Tactical Products Single Point Sling keeps the gun in the ready position in the center of the body, yet allows the weapon to be instantly brought to bear. The resulting weapon is much more functional, and able to use almost any non-magnum round out there.

Twilight 2000 Notes: This weapon does not exist in the Twilight 2000 timeline.

Notes: This is a modified Remington 870 shotgun (stock cut off and barrel cut down) which attaches under the barrel of the M-16 series, CAR-15, or M-4 Carbine series. The rifle magazine is used as the shotgun grip, in the same manner as the M-203. The following information is for the shotgun part of the weapon only; the M-16, CAR-15, or M-4 works in the normal manner.

Notes: This is a simple pump-action shotgun. The MS-9111 has a sight rib and bead sights, and the MS-9112 has rifle-style sights to allow accurate firing of slugs or shot. The stocks and the slide are made of simple Turkish walnut, and most of the metal is blued steel, except for some chromed parts in the bolt and barrel. The receiver has a claw mount for optical sights.

The MS-9113 and MS-9114 are designed for hunting (particularly turkey hunting), and are not generally found with rifle-style sights (though it is an available option). The MS-9113 has a 28" barrel and an interchangeable screw-in choke system with 5 chokes; the MS-9114 has a 22" barrel with a fixed choke optimized for turkey hunting.

Twilight 2000 Notes: This weapon does not exist in the Twilight 2000 timeline.

Notes: An American-made pump shotgun, it is available with folding stocks, Magna-Porting to reduce muzzle climb, pistol grips, sight mounts, and stockless versions, as desired. It is probably the shotgun with the widest amount of options available without having to make a special order.

Notes: There are several versions of the M500, designed for specific markets. The M500 Camper is a stockless small-caliber version, with synthetic pistol grip and slide, made for personal defense. The M500 Security (also known as the Home Security) is a short-barreled riot gun with an extended magazine and a foregrip on the pump slide; the furniture is of black synthetic and the external metalwork is blued. The M500 Bullpup is a military weapon, made with matte black synthetic furniture and external metalwork, and with a ported barrel, bayonet lug, and recoil pad. The M-500 Viking Slug Gun was introduced in 1996; it comes in rifled and non-rifled barrel versions (each with a 24-inch ported barrel), and uses synthetic furniture (usually in dark green) with metalwork which is normally finished in black phosphate. The 12-gauge Viking Slug Gun is drilled and tapped for a scope mount (the rings and a Tasco 1.5-4.5x scope is normally included when purchased from Mossberg, though I have not included the scope in the cost here), and also has backup iron sights. 1997’s Model 500 USA is essentially a civilian version of the military Mossberg M-500 variants; it has a 20-inch ported barrel, heavy-duty sling swivels, black synthetic furniture, and dark Parkerized external metalwork. In 1998, the M-500 Trophy Slugster was also introduced, which has a 20-gauge ported rifled barrel, synthetic or walnut furniture, and metalwork finished in black or dull natural metal. In 2004, the Grand Slam Turkey Variant was introduced; this version comes in two gauges, uses a 20-inch barrel with a ventilated sighting rib atop the ported barrel, adjustable rear sights and a bead front sight (both with light-gathering fiberoptic inserts), and the synthetic stock and external metal finished in one of two camouflaged patterns (Mossy Oak Break-Up or Real-Tree Hardwood). The Grand Slam Turkey is equipped with Extra Full Choke unless otherwise requested by the buyer. The Viking Slug Gun, Trophy Slugster, and Grand Slam Turkey all have thick rubber recoil pads on the butt. Viking Slug Guns with rifled barrels and the Trophy Slugster are not recommended for use with shot (especially steel shot), as firing slug through the rifled barrels can easily ruin the rifling.

Twilight 2000 Notes: The Viking Slug Gun and Model 500 USA are extremely rare variants in the Twilight 2000 timeline; the Trophy Slugster and Grand Slam Turkey do not exist in the Twilight 2000 timeline.

Notes: The M-590 was first designed as a military/police version of Mossberg’s M-500, and have been in US military service since the early 1990s. (Civilian versions appeared a short time later.) Though the M-590 series is to be replaced by the HK/Benelli M-1014, M-590s will probably soldier on for a long time to come.

As with the M-500, the M-590 is at its core a conventional pump-action shotgun. The M-590 may be had with all-steel metalwork, wooden stocks, extended magazines, and a plethora of other accessories and modifications. Military versions typically have polymer stocks and pump slides, an aircraft-quality aluminum alloy receiver and magazine tube, a high-quality steel barrel and barrel extension, and aperture rear and blade front sights. Some military models also may have a bayonet lug, an adjustable ghost ring rear sight, and a perforated aluminum meat shield above the barrel. Most military models also have ambidextrous controls and an improved extractor. Military models are almost always chambered for 2.75-inch shells, while civilian and police models (and some military versions acquired for special applications) may have chambers which can take both 2.75-inch and 3" shells.

Variants of the M-590 include the M-590A1, which uses a heavier barrel (primarily for cooling and to increase strength), a safety selector with a different shape which allows the shooter to tell when his weapon is or is not on safe, even in total darkness, and an all-metal trigger guard. The M-590A1 also comes in a short version with a 14-inch barrel (normal barrel lengths for the M-590 are 18.5 and 20 inches) which is available only to military and law enforcement concerns. This 14-inch-barreled version can also be had in a stockless configuration, with just a pistol grip. An unusual variant of the M-590A1 has the Knoxx Sidewinder magazine modification; this replaces the normal tubular magazine with 10-round drum magazine, with attendant changes in the feed mechanism and the fore-end. The M-590A1 Bantam is another modification of the M-590A1; designed primarily for teenagers and smaller-statured shooters, it is nearly 3 centimeters shorter, accomplished primarily by shortening the stock.

Another variant of the M-590A1 is done by Vang Comp Systems; this version of the Model 590A1 with a 14-inch barrel includes a back-bored barrel, a lengthened forcing cone, a ported barrel, a modified tubular magazine that feeds more reliably, an enlarged safety, a shortened fore-end with a sidesaddle with a spare shell holder (6 shells), and a synthetic pump lever with an attached flashlight receptacle. The stock is a fixed synthetic Davis Speedfeed stock with a compartment for four more shells and includes a recoil pad. The finish is Mossberg’s new Marinecote, which is highly resistant to corrosion and wear. The sights are replaced with an adjustable rear ghost ring-type and a front ramp with a luminous white dot. The barrel is designed to concentrate the shot; it doesn’t have a specific choke per se, but is designed to put most of the pellets into a human torso at 25 meters.

Twilight 2000 Notes: The M-590 and M-590A1 are the primary combat shotguns for the US military in the Twilight 2000 timeline, and they are quite common amongst US and Canadian citizens as well. However, the Knoxx modification for the M-590A1 does not exist in the Twilight 2000 timeline, nor does the Vang Comp modification.