The M7S caseless sub machine gun

The M7S is a variant of the M7 Caseless Submachine Gun, which fires 5 x 23mm M443 Caseless Full Metal Jacket ammunition. This variant features an external flash and SS/M 49 sound suppressor on the barrel along with a flashlight. Recoil from all but sustained fire is very controllable. Although the M7 submachine-gun is primarily issued to vehicle crews, it is also a favorite of commando teams in its sound suppressed version. Sustained automatic fire tends to cause the muzzle to “walk” upwards as recoil compounds. Submachine guns, while not accurate over long distances, are particularly effective in close quarters. Muzzle flash is significantly decreased, and firing the weapon gives a barely noticeable sound, increasing stealth applications for the M7S Submachine Gun and increasing accuracy from decreased recoil making the weapon more efficient at medium-long range. It is a good weapon for stealth and hit-and-run missions.I have got this info from halopedia.com

The beam rifle

A Particle Beam Rifle is a battery-powered directed-energy weapon that fires ionized particles at its targets, instead of accelerating small projectiles. The weapon is nearly silent, negligible muzzle signature, weighs considerably less than its UNSC analog and inflicts wounds akin to the 14.5mm SRS 99 AM — and is considered by all assessments to be a force multiplication. The use of Particle Acceleration offers two distinct advantages, the first is its damaging properties over the UNSC Sniper Rifle, as the ionized particles can pass through material easily, making it effective against targets behind cover. The Type-50 SRS also excels at target penetration, maximizing its lethality, as the beam will always pass through a target completely. Although the size of the wounds inflicted on a target are small, the damage done is similar to most Directed Energy Weapons used by the Covenant.
The Type-50 SRS is unusually shaped, and takes design cues from the Covenant Plasma Rifle in several respects - the barrel of the weapon is very long with its scope located on the top, and appears to slide into the weapon for storage. The scope on the particle beam rifle has two levels of zoom for greater accuracy, like its UNSC counterpart it is capable of 5 and 10 times magnification. The round section in front of the hand guard and trigger area of the weapon appears to contain the Type-50s "ammunition", after the weapon has completed its firing sequence, the section rotates presumably to "chamber" another "round". Human military experts do not understand how exactly the weapon works or how it is reloaded or recharged. Throughout the Human-Covenant War the particle beam rifle is not encountered often, and it is not until the final years of the war that it becomes much more common. Whether it is indicative of a widespread change in battlefield doctrine or a local reorganization of unit structure is unknown.I have got info from halopedia.com

The shade

The Shade is a Covenant stationary gun turret and is a anti-infantry or anti-air weapons platform, manned in third person like a vehicle. It consists of a sturdy base and a floating, mobile, turret-like seat with control systems for its "nozzle". It first appeared in Halo: Combat Evolved and was a simple turret; an anti-infantry cannon but was lacking any real defensive armor. In Halo 2, the Shade was mostly protected with energy shields at the front of it, similar to a Jackal's. A similar gun to the Shade can be found as a defensive weapon on Shadows and Spirit and Phantom dropships. In Halo 3, the Shade's shield is replaced with real physical armor, the base is now firmer, and the Shade has a much bulkier reinforced forefront to protect the gunner.
The first known encounter with Shades was during the First Battle of Harvest. Spirit dropships attacked convoys of fleeing civilians, as well as a Warthog carrying Johnson and Byrne.I have got this info from halopedia.com

The brute shot

The Brute Shot is has a rather peculiar design, as the user carries it low, rather than using the hilt or handle of a weapon. It has a quite fast firing rate for a grenade launcher; capable of firing four grenades in around three seconds. It, like the other Brute weapons, has a blade slung onto the bottom of the weapon to increase the melee damage. The Brute Shot can hold up to 18 rounds, with 6 in the gun itself.
[edit]Ammunition
It seems to fire a type of grenade similar to the Frag Grenade at very high velocities that bounces off of and around most surfaces, although originally it was supposed to shoot plasma grenade like projectiles. It was first encountered during Battle of the Flood-controlled Shield World, where it was used to a deadly effect against the crew of the Spirit of Fire. The grenades seem to be belt fed through the top of the weapon. The splash damage from this weapon is extremely high, and it also has a very sharp curved bayonet near the back on the underside of it, which is used as a powerful melee weapon. This blade delivers a higher than normal amount of melee damage.I have got this info from halopedia.com

The mauler

The Type-52 Mauler is an unusual weapon exclusively used by the Jiralhanae as a handgun, although human military experts have classified it as more of a handheld shotgun then anything else. The Mauler is based on the Jiralhanae's Pre-Covenant technology, meaning it has been in use since they first learned how to create a firearm. It is an unusual design more comparable to a revolver than a shotgun with regards to it's loading style; it's hand grip is somewhat reminiscent of the Sangheili Energy Sword. The magazine holds 5 shells of an unknown type of ammunition. The magazine appears to constantly keep the shell at a consistent superheated temperature. The mauler is mainly employed by Jiralhanae security forces, and is not seen by Humans until the Battle of Earth. The weapon also appears to be gas operated as a type of gas can be seen exiting the weapon when fired. Like all Jiralhanae weapons the Mauler is equipped with a small blade underneath, making it a formidable melee weapon.I have got this info from halopedia.com

The spiker

The Type-25 Carbine is an automatic fire, magazine fed, double barrel weapon, that fires metal spikes that appear to be superheated by some sort of electrical discharge that occurs before the spike is shot from the barrel of the weapon. Two large blades made of tungsten carbide,[2] an extremely strong and durable material, are mounted under the barrel of the weapon, increasing its close quarters effectiveness. The Spiker ammunition is fed into the weapon via a small drum magazine with a 40-round capacity. The drum magazine is located on the underside of the weapon, behind the blade and in front of the trigger.
This weapon resembles human technology more closely than it does the other weapons in the Covenant’s arsenal. It performs admirably in a variety of environments; it is a widely held belief that the weapon could sit unattended for several weeks in an active latrine and still operate as issued with no maintenance performed on it. Unfortunately this is not far from the truth. Though it was first observed over a quarter century ago[3] this weapon has not been seen in the hands of front line troops until just recently. The Spiker is based on the Jiralhanae's native pre-Covenant technology, meaning it has been in use since they first learned how to create a firearm. Although the Spiker is classified as a Carbine, it is more of a counterpart to the UNSC's M7 SMG, having very similar range and penetration capabilities.
[edit]Advantages
In the field, Brute Spikers have similar penetration and lethal range to the UNSC M7 SMG, but there are a few key differences. Unlike SMGs, there is little recoil, and therefore almost zero “rise” when using them in their default, full-automatic setting. This actually makes them a little more efficient and accurate than the SMG in combat situations, since there is no need to adjust aim to compensate for recoil. The spike's high velocity and kinetic impact against shields is high, although the rounds are simply deflected or melted by the energy shield before inflicting damage to the underlying structure. The Spiker can usually kill a heavily armored and shielded target with a single magazine. The spikes do terrible damage to human flesh, and can tear through armor with ease, creating devastating wounds that are extremely painful for those who survive an attack.[4] Its two large blades are very deadly against shielded and unshielded infantry at close range, as they can be used to either slash or stab an enemy with fatal effects. A SPARTAN-II or an Elite can duel-wield Spikers doubling their firepower.I have got this info from halopedia.com

The energy sheild

Energy Shields are an important piece of technology that protect the users from harm, if only for a short time. Energy Shields, which are generated by MJOLNIR armor, Elite's armour, Brutes Power Armor and Drone Leader's exoskeleton, provide the user with an extra layer of protection. However, the shields will collapse after taking multiple shots. It will protect the user's Health from damage until it is depleted, and it will regenerate after a while, provided that the user is not injured during this time. Be forewarned: although the shield protects your health, it doesn't render you invincible. Pay attention to your shield meter, and if it is depleted, seek cover until it regenerates. Also, it will not protect you from everything, and rockets, grenades, sniper bullets, and some other weapons such as the Needler may shred right through it. Energy shielding is also more vulnerable to plasma-based weaponry (e.g. the Covenant Plasma Pistol, especially overcharged) than to ballistic weaponry (e.g. the UNSC Assault Rifle). Any person will die, no matter how much resistance their shield has, if they are assassinated.
In Halo: Combat Evolved it is shown at the top-right corner of the screen above the health bar, in Halo 2 it is in the bottom-left above the motion tracker, and in Halo 3 it is in the top-center of the screen. They have been modified since Halo: CE to charge faster and be more resistant.I have got this info from halo.com