35mm autocannon
From Halopedia, the Halo wiki
The 35mm Semi-Autocannon is a Covenant Loyalist weapon mounted on the Brute Chopper.
The 35mm Autocannons are the primary offensive asset of Brute Choppers, and each Brute Chopper is mounted with four linked forward-firing 35mm autocannons.
This cannon is surprisingly powerful, and its ammunition is probably a larger form of the Spiker round.
It most likely uses a Gast firing mechanism.
Tactics
The 35mm Autocannon uses a very powerful shell, but has a very low rate of fire. Also, the rounds are too slow to take down fast targets, and so it is most effective to:
- Use this gun on short-medium range
- Lead targets
- Drive forward or stop momentarily, because the guns are forward mounted on a mobile section of the Chopper
- Don't attempt to use this gun against multiple targets simultaneously.
When facing this weapon, effective countering tactics are to:
- Avoid the incoming rounds, which are slow enough
- Prepare an anti vehicular weapon, as the driver may attempt to splatter you
- Try to attack a Chopper driver with one or more allies: he/she won't be able to lead and shoot down multiple targets surrounding his/her craft
Remember that the 35mm Autocannon can only shoot down one enemy at a time, so don't rush among enemy formations, and don't stay there for too long.
Avoid excessive turning while firing as this will throw off the rounds' trajectory.