Mass Effect 2 - Weapon Upgrades

Heavy Pistol

Heavy Pistol Damage (5 Upgrades)

• 1. Can be found during the story mission - Dossier: The Quarian. 
• 2. Can be found during the loyalty mission - Thane: Sins of the Father. 
• 3. Can be found during the loyalty mission - Jacob: The Gift of Greatness. 
• 4. Can be Purchased on Tuchunka from Fortrack's Database.
• 5. Can be Purchased on The Citadel from Rodan Expeditions

AP Heavy Pistol - Unlocked after purchasing 2 damage upgrades. Heavy Pistol Critical - Unlocked after purchasing 3 damage upgrades.

Sniper Rifle

Sniper Rifle Damage (5 Upgrades)

• 1. Can be found during the story mission - Dossier: The Warlord.
• 2. Can be found during the story mission - Reaper IFF.
• 3. Can be found during the loyalty mission - Garrus: Eye for an Eye.
• 4. Can be Purchased on Omega from Omega Market.
• 5. Can be Purchased on The Citadel from Rodan Expeditions

AP Sniper Rifle - Unlocked after purchasing 2 damage upgrades. Sniper Headshot Damage - Unlocked after purchasing 3 damage upgrades.

Assault Rifle

Assault Rifle Damage (5 Upgrades)

• 1. Can be found during the story mission - Dossier: the Professor.
• 2. Can be found during the story mission - Dossier: The Quarian.
• 3. Can be found during the loyalty mission - Samara: The Ardat-Yakshi.
• 4. Can be Purchased on Tuchunka from Fortrack's Database.
• 5. Can be Purchased on Illium from Gateway Personal Defense.
• 6. (DLC) Can be found during the loyalty mission - Zaeed: Price of Revenge. You must choose the Renegade option half way through.

Assault Rifle penetration - Unlocked after purchasing 2 damage upgrades. Assault Rifle Accuracy - Unlocked after purchasing 3 damage upgrades.

Sub Machine Gun

SMG Damage (5 Upgrades)

• 1. Can be found during the story mission - Dossier: Archangel.
• 2. Can be found during the story mission - Dossier: The Assassin.
• 3. Can be found during the loyalty mission - Miranda: The Prodigal.
• 4. Can be Purchased on Illium from Gateway personal Defense.
• 5. Can be Purchased on The Citadel from Rodan Expeditions.

SMG Shield Piercing - Unlocked after purchasing 2 damage upgrades. SMG Extra Rounds - Unlocked after purchasing 3 damage upgrades.

Shotgun

Shotgun Damage (5 Upgrades)

• 1. Can be found during the story mission - Dossier: The Convict.
• 2. Reward for completing the loyalty mission - Grunt: Rite of Passage.
• 3. Can be Purchased on Omega from Kenn's Salvage.
• 4. Can be Purchased on Tuchunka from Fortrack's Database.
• 5. Can be found during the story mission - Reaper IFF

Shotgun Shield Piercing - Unlocked after purchasing 2 damage upgrades. Shotgun Extra Rounds - Unlocked after purchasing 3 damage upgrades.

Heavy Weapons

Heavy Weapon ammo (6 Upgrades)

• 1. Can be found during the story mission - Freedom's Progress.
• 2. Can be found during the loyalty mission - Mordin: Old Blood.
• 3. Can be Purchased on Omega from Kenn's Salvage.
• 4. Reward for completing the exploration mission N7: Blood Pack Comm Relay.
• 5. Reward for completing the exploration mission N7: Blood Pack Base.
• 6. (DLC) Can be found during the loyalty mission - Zaeed: Price of Revenge. You must choose the Paragon option half way through

ML-77 Missile Launcher - Unlocked after purchasing 1 heavy weapon ammo upgrade M-622 Avalanche - Unlocked after purchasing 2 heavy weapon ammo upgrade M-920 Cain - Unlocked after purchasing 3 heavy weapon ammo upgrade