Mosa-pattern carbine

This article is about the model introduced in Halo 5: Guardians. For the model introduced in Halo 2, see Type-51 carbine. The Mosa-pattern Carbine, designated the Type-57 Carbine (T-57 C) by the UNSC, is the post-Covenant War successor to the Type-51 carbine. It saw wide use within Jul 'Mdama's Covenant.

Design details
The T-57 carbine is a versatile semi-automatic rifle renowned for its accuracy and long range. The weapon was used by various Covenant splinter groups after The Great Schism as a close-medium to medium-long range weapon. It fires at a maximum rate of 300 rounds per minute. Its color varies slightly from its predecessor, being a dark indigo as opposed to the T-51 Carbine's traditional purple.

Type-57B Carbine
The T-57B uses a streamlined manufacturing process and reactive materials in place of radioisotopes for coating projectiles. It takes 7 rounds to kill a Spartan in War Games. This variant has a holoscope. It is ranked a Common REQ in Warzone simulations, and is available at Level 2 energy while giving 50 REQ points if sold.

Type-57B variants

 * Rain of Oblivion: The Rain of Oblivion, whose grip has been held by a thousand heroes and a hundred villains, is an improved Carbine with fully automatic action and increased maximum spare clip count at the expense of a lower scoped range. The high rate of fire combined with relatively solid damage enable it to mow down a fully shielded spartan in 0.84 seconds. It is ranked an Uncommon REQ in Warzone simulations, and is available at Level 3 energy while giving 75 REQ points if sold.
 * Blood of Suban: The Blood of Suban is an advanced Carbine that fires armor-piercing blamite shards. These powerful explosive blamite needles will kill a Spartan in as little as 5 shots in 0.90 seconds.

Changes from Type-51 carbine in Halo 2: Anniversary

 * Much higher accuracy at longer ranges.
 * Slightly more bloom.
 * Magazine size increased from 18 to 20, also resulting in more reserve ammo to coincide with new magazine size (72 to 80).
 * Lighting on magazine will gradually change color from blue to red as ammunition is depleted, fulfilling a similar function as seen in Halo 2 and Halo 3.
 * Retains the 7-headshot kill of the Halo 4 version of the T-51 carbine.
 * The weapon's coloring has been altered to be more similar to that of the Beam Rifle in Halo 4.
 * Players using smart scope with the T-57 carbine now bring up its holoscope instead of a full-screen scope.
 * In addition, the aiming reticle no longer changes between hipfiring and scoped-in firing.

List of appearances

 * Halo 5: Guardians
 * Halo Infinite