40mm Auto Cannon (Apocalypse)
This little weapon is often underrated. It has the drawback of requiring ammunition, but the good news is that the ammo for this weapon is fairly cheap and doesn't take much space, so a large amount can be carried with the gun. What this weapon lacks in overall efficiency it makes up for with performance. It has a good rate of fire and, most importantly, it is the most accurate projectile weapon you have access to in the beginning of the game, with an impressive 70% base accuracy rating. A small group of hoverbikes armed with 40mm Auto Cannons can easily bring down the earlier scout craft in the game and can even prove to be a nuisance to the larger ones later on.
An additional perk for the weapon is poor property damage which means that you will not cause much damage to the city during intense air combat.