M90 Assault Shotgun

The M90 Mk.I Shotgun is a United Nations Space Command firearm.

Introduction
The M90 Shotgun is the resident UNSC close combat weapon, and packs extreme stopping power at close ranges. It is often wielded in urban conditions, where the close ranges are conducive to the shotgun's mode of operation. The shotgun also makes a perfect defense weapon to fend off Covenant boarding parties inside starships.

The weapon's power lies in the great stopping power of a cloud of buckshot, which, on the other hand, is useless at long ranges. However, it should be noted that experienced shotgun users can engage enemies at medium ranges with a shotgun, although this proficiency is uncommon.

Advantages
Since the shotgun fires 15 spreading pellets per shot (in Halo 2, it fires fewer pellets and in random amounts), the combined force of each relatively weak pellet does a significant amount of damage. Its high damage potential (as much as a rocket in Halo 1 at close range) makes it effective against almost any Covenant unit (even the Hunter, if shot in its exposed back), but only if the player can get close enough to render the gun effective. The shotgun can also be used, though not necessarily effectively, against all manner of vehicles, and many players consider it the ideal weapon with which to destroy Banshees which happen to be within the shotgun's effective range. In addition, this weapon is extremely effective against all forms of Flood at short and medium ranges. The shotgun also reloads in a different manner than the rest of the weapons in Halo. Each round is put into the shotgun, one-by-one, so reloading all twelve shells at one time may take a while. However, the player may interrupt the reloading process at any time and fire with however many rounds are currently loaded into the weapon. Another popular way of firing the shotgun involves inserting a shell, firing, and then inserting another shell, etc. While this takes slightly longer, it has the advantage of always having eleven shells chambered. Apart from that it is devastating in close combat, stronger than an Energy Sword swipe, but slightly weaker than the Energy Sword lunge.

Halo 1
Although many skilled players are able to hit a target at almost any distance using this weapon, the shotgun's greatest limiting factor is its range, making it useless in any wide-open terrain. Ammunition for this weapon is also sometimes difficult to come by in single-player.

Halo 2
Due to its significantly reduced ammo capacity and shortened range, the shotgun in Halo 2 has a low effective range of about 7-12 feet, making it practically useless on larger maps such as coagulation or containment.

Halo : Combat Evolved

 * The Shotgun can best most medium range weapons in normal matches. Don't be afraid to lay it on while using cover, the 12 rounds last longer then you might think.
 * Use the POP tactic. Use your corners and the element of surprise. Most enemies don't think that you will "pop" back in your weakened state. Remember though, that above average players can react to something like this. The trick is timing. Too early, and you get killed, too late and they gain the edge. Grenades can also help in this situation.
 * When attacking, try to sneak up to your destination. It's easy to score kills on unprepared people, especially if they're clumped up, say, around a flag. Throw grenades to soften targets before you enter, if they know you're coming. This is true for most weapons, but a shotgun expert can get shields down, and kill people 1 by 1 (much like turkey hunting), using cover and popping out multiple times.
 * Hide and take down Scorpions and even Banshees with it as it does as much as a rocket at close range
 * The Shotgun's pellets travel much further in Halo 1 than in Halo 2. As such, the shotgun can sometimes be used effectively at a considerable distance, especially against unshielded enemies.  If you miss a headshot with a sniper rifle or hit someone with an plasma pistol overcharge, don't hesitate to pull out the shotgun to get a "pickup" kill.  If you're lucky, one of the pellets will catch them in the head, but typically, it should take no more than two shots to get the kill anyway.
 * Just like in Halo 2, always follow close-range shotgun blasts with a melee attack. Make sure you finish the job.
 * The shotgun is the only weapon which can be stopped before a complete reloading (between each shell). To interrupt the reloading, simply take another action, such as switching weapons, throwing a grenade, or even firing the shotgun.  Each shell is put in individually and does not take long to do so, so reload as you see fit.

Halo 2

 * The shotgun is significantly weaker in Halo 2. It's ROF is decreased, reload time increased, and its range is lessened. However, there are a couple things to keep in mind while using this weapon, to make the most of it.
 * The shotgun is your best defense against the sword, time your shots right and they'll never be able to touch you. However, In XBL, lag can make this ineffective.
 * You will almost always need to follow up a shot with a melee attack, simply because most players aren't stupid enough to let you get close. The lunge feature in Halo 2 makes this work well against most enemies.
 * Timing is everything. Always get closer then you think you should, because the shotgun can only get a kill shot in under 5 feet. (read:point-blank. this is strange because all of the pellets still hit the target at longer ranges, but it still does less damage) If you usually follow up with a melee though, different timings are needed. Some people switch to "boxer" button settings in all shotgun matches.
 * In Halo 2, the shotgun takes an extremely long time to reload if you have fired many shells. However, as in Halo 1, the reloading can be interrupted.
 * While combating brutes aim the spray of projectiles at the head to get a quicker kill.


 * The Shotgun may be inferior to the guided SPNKR, but it is still useful against lightly armored vehicles; an experienced Shotgunner can easily take down an inexperienced player in a Ghost. In fact, with the right maneuvering and a little luck, a player armed with a shotgun can take down a tank. It takes about 7 accurate shells to destroy a Wraith on Normal
 * With proper timing, the Shotgun can easily take down a Plasma Sword weilder. Once the opponent begins lunging while facing you, shoot at the right time. The closer the opponent was when you shot your round, the better your chances of survival, because it would be practically point-blank range (the best range for a shotgun) the closer he gets.

Halo 3 Beta



 * The shotgun has a slightly changed appearance, it isn't as out of proportion in Halo 2, as in the barrel isn't huge, and there is what appears to be a tactical flashlight on the left side of the gun, but flashlights/nightvision can't be used in multiplayer.
 * It has a reduced magazine size, 6 in the chamber and 48 extras.
 * It has a slightly extended range, as the pellets don't spread as far. However, this change is very subtle. The shotgun is still incapable of doing worthwhile damage at any further than a couple feet.
 * Whenever you reload the shotgun, after putting the shells in you cock the gun at an angle that crosses the screen.
 * It is most effective in Snowbound by staying in the tunnels below the surface. It can also be a nasty surprise for players too eager to charge through shield doors.
 * The M90 is best used in conjunction with a Bubble Shield; toss one down in the middle of a firefight and blow them away once they step inside the shield.
 * If you're being attacked by someone with a shotgun, follow the same strategies as in every other Halo game - run the other way, firing backwards. You can usually beat them in range. If they get too close, use a few bursts from the assault rifle followed by a melee.

Influence
The mechanical design of the M90 shotgun is loosely based on the South African Neostead shotgun which features dual six-round top-loaded magazines. Its pump mechanism operates in a forward-back motion, due to its rear-load configuration (rather than normal back-forward motion). The weapon features two integral tube magazines with a total capacity of twelve rounds (6+6+1) and ambidextrous bottom ejecting shells. It is chambered for standard 12-Gauge 2.75-inch cartridges. The aesthetic design is a composite of multiple pump-action designs.

Multiplayer Role
The shotgun's effectiveness in multiplayer games varies depending on the terrain; indoors and in tight spaces, it is considered by many players to be the weapon par excellence. Many players carry the shotgun and a long range weapon, such as the Pistol or Battle Rifle, thus making for a more flexible arsenal. Continuous firing by using the magazine and loading one shell then firing does not affect the rate of fire significantly, prompting a few players to employ a tactic dubbed "shotgun sniping" as suppressive fire across medium-sized maps. On the Internet, many games are shotguns only, with most of these battles being set in the map Battle Creek (Level).

Appearances
The Shotgun appeared in Halo. The shotgun had blue sights on the tip and top of the weapon. In Halo 2 the color changed to green. It also appeared much blacker. In Halo 2 also, Brutes are seen wielding it. This weapon is to return in Halo 3. It also seems to have returned to the original blue lights on the sights, although from the ViDoc Et Tu, Brute?, it returns the feature of blue iron sights from Halo with an added flashlight to the side of the foregrip. (In Halo and Halo 2 the shotgun has the flash light attached/embedded under the the foregrip) It features Halo 2's flat black color.

Ammo
The M90 Shotgun uses 8-gauge 3.5" Magnum Buckshot shells. This type of shotgun shell is not even produced in modern times, as 8-gauge shotguns were simply too cumbersome, among other reasons. The shells would also produce tremendous recoil, and would be painful for most shooters.

Character Compatibility

 * Spartans
 * Marines
 * Elites
 * Brutes
 * Jackals(have animation but not used)
 * Drones (have animation but not used)
 * Flood Combat Form (Human)
 * Flood Combat Form (Elite)