Gunboat turrets.

[Hielor]

All Transport and Capital Guns are typeless and do 100% damage to all sheild types.

I can confirm this for transport guns.

For example, the ammo for the transport turret type 1 (the "pulse" one):

[Munition]
nickname = dsy_transturret_04_ammo
hp_type = hp_gun
requires_ammo = false
hit_pts = 2
hull_damage = 40
energy_damage = 1250
one_shot_sound = fire_pulse4
munition_hit_effect = ci_pulse_04_impact
const_effect = ci_pulse_04_proj
lifetime = 1.340000
force_gun_ori = false
mass = 1
volume = 0.000100

Compare to the ammo for the Adv Deb II:

[Munition]
nickname = co_turret02_mark04_ammo
hp_type = hp_gun
requires_ammo = false
hit_pts = 2
hull_damage = 23.900000
energy_damage = 494
weapon_type = W_Pulse01
one_shot_sound = fire_pulse4
munition_hit_effect = ci_pulse_03_impact
const_effect = ci_pulse_03_proj
lifetime = 1.15
force_gun_ori = false
mass = 1
volume = 0.000100

I didn't know this before, this is definitely interesting. Thanks for pointing that out.