From Halopedia, the Halo wiki
The M41 LAAG is a triple-barreled, electric-powered, linkless, belt-fed weapon, capable of firing 500 12.7×99mm armor-piercing rounds per minute. Turret traverse rate is 100 degrees per second and weapon elevation rate is 60 degrees per second. Recoil from sustained fire is prodigious and negatively impacts accuracy at long range.
Its extended variant, the M41 Extended Light Anti-Aircraft Gun, is a four-barreled machine gun capable of firing depleted uranium containing pressurized atmosphere. This variant is mounted on the aft of the OF92/EVA Booster Frame.
When mounted on the Mastodon APC, the M41 can be remote-controlled.
The 12.7×99mm rounds is capable of exerting upwards of five times as much damage as the 7.62×51mm rounds used in the MA5 series of assault rifles, and the M41 is a relatively accurate example of its power compared to the smaller 7.62mm round.[note 1]
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