ALI-50 110mm autocannon

The 110mm rotary cannon is a ship-to-ship projectile weapon utilized by the United Nations Space Command's GA-TL1 Longsword, specifically its C709 variant. It is essentially a large Gatling gun that fires 110mm shells and is used to engage enemy space fighters and starships. Its shells are made of depleted uranium, and the gun is considered "hopelessly archaic" compared to the weaponry of the Type-31 Seraph.

Trivia
According to Robert McLees, the concept of "110mm rotary cannons in fighter/bombers", as stated in the the Halo Story Bible, is "bad crazy"; this seems to imply that the weapon's high caliber is the result of a typographical error. However, the number remains unchanged in the 2010 edition of Halo: First Strike, and its validity is reinforced in Halo: The Essential Visual Guide, which states the C709 variant of the Longsword is equipped with a "heavy rotary cannon".

List of appearances

 * Halo: First Strike