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So far, I have:

AP-5
Volcano Lance (Knight Castellan)
Volcano Cannon (Shadowsword)
High Power Doomsday Cannon (Doomsday Ark)
Tachyon Arrow (Anrakyr the Traveler)
Deathray [If Mephrit in half range] (Doomscythe)
Heavy Gauss Cannon [If Mephrit in half range] (Heavy Destroyer)
Fusion Blasters [With Advanced Targeting System] (XV25 Stealth Suits, XV8 Crisis Suits)
Heavy Rail Rifle [With Advanced Targeting System] (XV88 Broadsides)
Grav Flux Bombard (Hellforged Leviathans, Relic Leviathans)
Lance Prism Cannon (Fire Prism)
The Red Axe (Mars Power Axe Relic)
Shokk Attack Gun (Big Meks)
Bubblechukas [AP-1d6] (Mek Guns)
Mega Choppa (Stompa)
Killsaw [Proppa Killy Warlord, on the charge/being charge/Heroically Intervened only] (Warboss)
Heat Lance (Scourges, Talos Pain Engine, Reaver Jetbikes)
Mori Quake Cannon (Warlord Battle Titan)
Reaver Volcanno Cannon (Reaver Battle Titan)
Saturnyne Lascutter [Melee] (Warlord Battle Titan)
Arioch Titan Power Claw (Warlord Battle Titan)
Reaver Chainfist (Reaver Battle Titan)
Reaver Power Fist (Reaver Battle Titan)
Dreadhammer Siege Cannon (Relic Typhon Heavy Siege Tank)
Laser volley cannon [Overcharge fire] (Deimos Pattern Vindicator Laser Destroyer)
Ghost Razors (Lugft Huron)
Monstrous Scything Talons (Hierophant Bio-Titan)
Mega Klaw (Kustom Stompa)
Heavy rail cannon (KX139 Ta'unar Supremacy Armour, Tiger Shark AX-1-0, Manta Super-Heavy Dropship)
D-Impaler (Cobra)
Dire Pulsar (Phantom Titan)
D-Bombard (Phantom Titan)
Wraith Glaive (Phantom Titan)
Blade Of Shadows (Be'Lakor)
Acid Maw (Carnifex)
Nemesis Quake Cannon (Warbringer)
Twin Volcano Cannon (Hellforged Falchion)
Burning Blade (Space Marine Power Sword Relic)
Plasma Incinerators [With Storm Of Fire, On 6s To-Wound] (Hellblasters)
Macro Plasma Incinerator [With Storm Of Fire, On 6s To-Wound] (Redemptor Dreadnought)
Melta Weapons [With Storm Of Fire, On 6s To-Wound] (Many Marine Units)
Malice [With Storm Of Fire, On 6s To-Wound] (Lias Issodon)
Metallophagic Stave (Rusted Claw Force Staff Relic)
Thermal Cannon [On 6s To-Wound, With Knight Of Mars Warlord Trait] (Taranis Knight Errant)

AP-6
Monstrous Rending Claws [On 6s to wound] (Patriarch, Broodlord)
High Power Doomsday Cannon [If Mephrit in half range] (Doomscythe)
Bubblechukas [AP-1d6] (Mek Guns)
Thundercoil Harpoon (Knight Valiant)
Belicosa Volcano Cannon (Warlord Battle Titan)
Malignas Beam Cannon (Hellforged Contemptor)

AP-7
Thundercoil Harpoon [On 6s To-Wound, With Knight Of Mars Warlord Trait] (Taranis Knight Valiant)

AP Infinity-Ignores Armor, but not Invulnerables
Life Drain [Melee Attacks] (Culexus)

Doomsday Cannon - High Power (Doomsday Ark) and Tachyon Arrow (Anrakyr the Traveler)) have an AP-5.

If you play Mephrit you also have at half range :
Deathray (Doomscythe) (AP-4 to AP-5)
Heavy Gauss Cannon (Heavy Destroyers) (AP-4 to AP-5)

And the Doomsday Cannon at half range goes to AP-6

You can also get the HGC on Annihilation Barges, right?

Also Stalkers, but they can't get dynastic codes.

Edit: No, the ABarge gets REGULAR Gauss Cannons. My bad.

Of the two armies I play (and of the units I use/have a cheat sheet for)

Chaos Space Marines:

Grav Flux Bombard: -5

Craftworld Eldar

Prism Cannon (Lance Mode only): -5

The Grav-Flux is on the Hellforged Leviathan, right?

And the Prism Cannon on the Fire Prism?

Yep

T'au:
Fusion Blasters [With Advanced Targeting System] (XV25 Stealth Suits, XV8 Crisis Suits) -5
Heavy Rail Rifle [With Advanced Targeting System] (XV88 Broadsides) -5

Much appreciated.

Orks have a couple:

Shokk Attack Guns are -5. Bubblechukkas can be -5/-6 (AP is -D6). Stompa's Mega-choppa is -5.

 Trimarius wrote:
Orks have a couple:

Shokk Attack Guns are -5. Bubblechukkas can be -5/-6 (AP is -D6). Stompa's Mega-choppa is -5.

Neat. Thanks.

Almost forgot (since it's in the errata, not the book) but a Goff Warlord with a Killsaw and the "Proper Killy" trait is -5 on the turn they charge, get charged, or heroically intervene.

For Imperial Knights:

The Thundercoil Harpoon on the Knight Valiant is AP6

Pretty sure fun elf Heat lances are ap-5.

I know Scourges can take Heat Lances-what else can?

Titan Weapons:
Belicosa volcano cannon (Warlord Battle Titan) -6
Mori quake cannon (Warlord Battle Titan) -5
Reaver volcanno cannon (Reaver Battle Titan) -5
Saturnyne lascutter [melee] (Warlord Battle Titan) -5
Arioch Titan power claw (Warlord Battle Titan -5
Reaver chainfist (Reaver Battle Titan) -5
Reaver power fist (Reaver Battle Titan) -5

Adeptus Astartes Ranged Weapons (Imperial Armour):
Dreadhammer siege cannon (Relic Typhon Heavy Siege Tank) -5
Grav-flux bombard (Leviathan Dreadnought) -5
Laser volley cannon [Overcharge fire] (Deimos Pattern Vindicator Laser Destroyer)-5

Adeptus Astartes Melee Weapons (Imperial Armour):
Ghost Razors (Lugft Huron) -5

Tyranids Melee Weapons (Imperial Armour):
Monstrous scything talons (Hierophant Bio-Titan) -5

Orks Melee Weapons (Imperial Armour):
Mega Klaw (Kustom Stompa) -5

T'au Ranged Weapons (Imperial Armour):
Heavy rail cannon (KX139 Ta'unar Supremacy Armour, Tiger Shark AX-1-0, Manta Super-Heavy Dropship) -5

Asuryani Ranged Weapons (Imperial Armour):
D-impaler (Cobra)-5
Dire pulsar (Phantom Titan) -5
D-bombard (Phantom Titan) -5

Asuryani Melee Weapons (Imperial Armour):
Wraith glaive (Phantom Titan) -5

Great criminy jiminies, that's a list!

Much appreciated!

Be'lakors Blade of shadows has AP-5 as well.

 JNAProductions wrote:
I know Scourges can take Heat Lances-what else can?

Talos, but just like with Scourge you're better off with the Haywire Blasters. AP-5 sounds cool but S6 on a single shot anti tank gun is aweful.

 JNAProductions wrote:
I know Scourges can take Heat Lances-what else can?

Reaver Jetbikes

Acid Maw upgrade on Carnifex.

Also, do soulburners count? (inflict direct mortal wounds).

topaxygouroun i wrote:
Acid Maw upgrade on Carnifex.

Also, do soulburners count? (inflict direct mortal wounds).

Those do NOT. I'm only counting stuff that has AP-5 or better, but does NOT ignore Invuln saves.

Otherwise, I'd have to list every single source of mortal wounds in the game, and that sounds tedious as feth.

Belicosa Volcano Cannon - if we're counting FW rules.

 Mad Doc Grotsnik wrote:
Belicosa Volcano Cannon - if we're counting FW rules.

Already got that, friendo.

We're scraping the bottom of the barrel for more AP-5 or better weapons now.

 JNAProductions wrote:

topaxygouroun i wrote:
Acid Maw upgrade on Carnifex.

Also, do soulburners count? (inflict direct mortal wounds).

Those do NOT. I'm only counting stuff that has AP-5 or better, but does NOT ignore Invuln saves.

Otherwise, I'd have to list every single source of mortal wounds in the game, and that sounds tedious as feth.

Carnifex acid maws do not inflict mortal wounds, they are just a AP-5 weapon.

 JNAProductions wrote:
We're scraping the bottom of the barrel for more AP-5 or better weapons now.

Nemesis Quake Cannon from the warbringer.

Spoletta wrote:

 JNAProductions wrote:

topaxygouroun i wrote:
Acid Maw upgrade on Carnifex.

Also, do soulburners count? (inflict direct mortal wounds).

Those do NOT. I'm only counting stuff that has AP-5 or better, but does NOT ignore Invuln saves.

Otherwise, I'd have to list every single source of mortal wounds in the game, and that sounds tedious as feth.

Carnifex acid maws do not inflict mortal wounds, they are just a AP-5 weapon.

I did include the Acid Maw-the "Those do NOT" was in reference to Soulburners.

Sorry for being unclear.

 JNAProductions wrote:
So far, I have:

AP-5
Animus Speculum (Culexus)

Animus Speculum is only -4 AP.

Reemule wrote:

 JNAProductions wrote:
So far, I have:

AP-5
Animus Speculum (Culexus)

Animus Speculum is only -4 AP.

Welp, that's my bad.

Removed off the list.

Hellforged Cerberus' Malignas beam cannon -6ap
Hellforged Falchion Twin Volcano Cannon -5ap

Red Axe (MARS Relic) is -5.