This article is about the model introduced in Halo 2. For the model introduced in Halo 5: Guardians, see Type-57 carbine.
The Type-51 Carbine was designed by the Iruiru Armory on Sanghelios, based on marksman rifles used earlier in the Sangheili's war-dominated history. Although it may seem as an oddity as most Covenant technology is energy-based, the Covenant use several other solid projectile-based weapons. The T51 is frequently used by Sangheili of various ranks, though its most prominent use is among Kig-Yar marksmen, who often utilize the weapon as an effective tool for sharpshooting and assassination. After the Great Schism Jiralhanae infantry were often deployed with this weapon. Though it was encountered as early as 2526 and was seen occasionally during the Human-Covenant War, it was not properly cataloged by the Office of Naval Intelligence until 2551. This was likely due to the similar role and performance of the Type-31 Rifle, which was seemingly overshadowed by the Type-51 in the later years of the war. The SPARTAN-IVs deployed aboard the UNSC Infinity also use the T-51 carbine as part of their on-mission loadouts, despite it being of non-UNSC origin.
The Type-51 Carbine is a recoil-operated and charger-fed, semi-automatic marksman rifle. It serves as medium to long-range weapon utilized by Covenant forces. The weapon's cylindrical magazine holds 18 rounds, and also provides indication of number of rounds left in the magazine by utilizing a holographic display. The back end of the weapon contains two circular openings, the forward one is the weapon's hand guard and the area in front of it is where the weapon's trigger is located. On the weapon's top rail is the magazine well and ammunition chamber, next to it is a hammer like device which springs back when the weapon is fired. The forward part of the weapon contains the Type-51 Carbine's barrel, which controls the rapid acceleration of the projectile out at a high velocity.
The Type-51 Carbine marks itself as unique among Covenant firearms by its ammunition. Rather than using plasma bursts which can be inaccurate and slow at long range, this weapon utilizes 8.7×60mm caseless radioactive projectiles; this ammunition can come in a number of compositions, but the Covenant primarily employ an extremely toxic compound mined from a radioactive moon in the Sangheili's star system, as well as several other locations in Covenant territory. The T-51 rifle can fire this projectile at supersonic speeds, when fired, the round, which is coated in a shielded material is accelerated to a speed anywhere from Mach 1 to Mach 5, traveling downrange at 2,296 feet per second. The round is powered along its entire flight path, consuming up to 50% of its total mass by the time it reaches its maximum effective range. The T-51 ballistic round can stop a target at up to six hundred and fifty yards.
Against light armored targets, the rounds' supersonic speed and super-heated nature ensures armor penetration on either the first or second impact. Impacts to the flesh can vary dependent upon range and speed - a single round impacting flesh at close range will penetrate deep into the target, and can nick bone. The kinetic energy from the impact of a round at close range can knock back an individual. Two rounds that impact the same area at close range will pass through the target easily. Upon impact the round releases a toxic material into a victims bloodstream, in addition to radiation burns the victim suffers. The chance of survival of being hit from the T-51 rifle is low. If the round has not struck a vital organ the victim only has a few minutes before the toxic chemicals kill the victim unless it is treated immediately. In most circumstances a surviving victim will require attentive treatment to ensure survival.
The Type-51 Carbine, with its 2× zoom ability is an excellent medium-ranged weapon; its accuracy and performance in the field makes it a popular choice for infantry who are required to engage enemy infantry:
The ballistic round gives off a light green trail, exposing the shooter's position, a weakness similar to the Type-50 particle beam rifle. Its distinct sound at close to medium range may also attract the attention of nearby enemies. The Type-51's firepower, when compared with its UNSC counterpart, the Battle Rifle, is stronger, yet slightly less accurate, especially if fired too fast. The magazine is also relatively small and when faced with shielded enemies, the player usually requires an entire clip to eliminate the target unless he/she aims at weak spots on the armor or energy shield systems.
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