M11 Autocannon

The M11 Autocannon was a throw back to the simpler days of conflicts, where the largest amount of shells put into a enemy would achieve victory. Gradually phased out in favour of more high-tech missile of Gauss Weaponry, with the desperate times of the Human-Covenant War, it again saw action. 
The M11 is a simple weapon, often deployed as a squad support/defensive weapon, being mounted on a tripod. It is gas operated and belt fed, drawing ammo in from an attached tin, drum or belt. Though less capable of the armour penetration possible with the 90mm AT gun on the Scorpion, or the M68 Gauss Gun found on the M12G1 LAAV, it does have effective light anti-armour and anti-infantry properties, being able to kill even shielded Covenant units in a shot. 
The weapon comes with an additional computer suite, much similar to the MA5 series rifle. It records ammo but it requires an attached scope from SWORDS to improve it's functionality. 
When fired, the bolt travels down the receiver rather than backwards to absorb recoil and direct it away from the shooter.