Nightsolo's Mass Effect Weapons

It's difficult to say which items are the "best" in any category, as some gamers may prefer, say, Damage to Accuracy.
Any class can carry any weapons.
Weapons have weight, and Shepard's Carrying Capacity determines how many you can carrry. As the weapons are leveled up, they weigh less. Carrying more weight increases the cooldown time on your powers.
Your squad mates are limited to two types of weapons each. What they get depends on who they are.
On a first playthrough, weapons can only be leveled to 5. On a New Game Plus, They can be leveled to 7 initially, and 10 as you find them again while playing.
Weapons can be modded. Each weapon has two mod slots, and the same mod cannot be used in two slots.
Mods will level up as you find another instance of the mod, up to level 5.
Heavy weapons are not moddable, and are not available to choose on the Loadout Screen.

Assault Rifles

Name	Where to Get
Adas Anti-Synthetic Rifle	Firefight DLC
Cerberus Harrier	Firefight DLC
Chakram Launcher	Omega DLC
Collector Assault Rifle	Retaliation DLC
Geth Pulse Rifle	Elkoss Combine Arsenal Supplies Shop
M-7 Lancer	Citadel: Shore Leave DLC, in the Archives
M-8 Avenger	Prologue: Earth
M-15 Vindicator	Kassa Fabrication Shop; or during Priority: Mars
M-37 Falcon	Kassa Fabrication Shop; or during Priority: Cerberus Headquarters
M-55 Argus	Preorder Bonus or Leviathan DLC
M-76 Revenant	Kassa Fabrication Shop; or during Priority: The Citadel II
M-96 Mattock	Kassa Fabrication Shop; or during Grissom Academy: Emergency Evacuation
M-99 Saber	During Priority: Horizon
N7 Typhoon	Groundside Resistance DLC
N7 Valkyrie	N7 Warfare Gear Preorder DLC or Omega DLC
Particle Rifle	During Priority: Eden Prime
Phaeston	Cipritine Armory Shop; or during Tuchanka: Turian Platoon
Striker Assault Rifle	Groundside Resistance DLC

Extended Barrel - Increases damage.
Magazine Upgrade - Increases rounds per magazine.
Piercing Mod - Allows bullets to pierce armor at reduced damage. Ignores defense on armored targets.
Precision Scope - Increases accuracy.
Stability Damper - Increases Weapon Stability.

Name	Where to Get
AT-12 Raider	Leviathan DLC
Disciple	Nos Astra Sporting Goods Shop, or during Kallini: Ardat-Yakshi Monastery
Geth Plasma Shotgun	Elkoss Combine Arsenal Supplies Shop; or duing Priority: Rannoch
Graal Spike Thrower	Cipritine Armory Shop; or during Priority: Rannoch
M-11 Wraith	Spectre Requisitions Shop
M-22 Eviscerator	Batarian State Arms Shop; or during Grissom Academy: Emergency Evacuation
M-23 Katana	Priority: Mars
M-27 Scimitar	Kassa Fabrication Shop; or during Priority: Palaven
M-300 Claymore	Cipritine Armory Shop; or during Attican Traverse: Krogan Team
N7 Crusader	N7 Collector's Edition DLC or multiplayer
N7 Piranha	Groundside Resistance DLC
Reegar Carbine	Firefight DLC
Venom Shotgun	Groundside Resistance DLC

Blade Attachment - Increases melee damage.
High Caliber Barrel - Increases damage.
Shredder Mod - Allows bullet to pierce armor at reduced damage. Ignores defense of armored targets.
Smart Choke - Increases accuracy.
Spare Thermal Clip - Increases spare shot capacity.

Name	Where to Get
Acolyte	Groundside Resistance DLC
Arc Pistol	Elkoss Combine Arsenal Supplies Shop; or duing Priority: Geth Dreadnought
Executioner Pistol	Groundside Resistance DLC
M-3 Predator	Prologue: Earth
M-5 Phalanx	Kassa Fabrication Shop; or during Priority: Tuchanka
M-6 Carnifex	Kassa Fabrication Shop; or during Arrae: Ex-Cerberus Scientists
M-11 Suppressor	Citadel: Shore Leave DLC, in the Sushi Restaurant
M-77 Paladin	Spectre Requisitions Shop
M-358 Talon	During Priority: The Citadel II
N7 Eagle	N7 Collector's Edition DLC or multiplayer
Scorpion	Aegohr Munitions Shop; or during Priority: Sur'Kesh

High Caliber Barrel - Increases damage.
Magazine Upgrade - Increases rounds per magazine.
Melee Stunner - Increases melee damage.
Piercing Mod - Allows bullets to pierce armor at reduced damage. Ignores defense on armored targets.
Scope - Increases accuracy.

Name	Where to Get
Blood Pack Punisher	Firefight DLC
Collector SMG	Retaliation DLC
Geth Plasma SMG	Firefight DLC
M-4 Shuriken	During Priority: Mars
M-9 Tempest	Kassa Fabrication Shop; or during Tuchanka: Turian Platoon
M-12 Locust	Kassa Fabrication Shop; or during Priority: Horizon
M-25 Hornet	Batarian State Arms Shop; or during Priority: The Citadel II
N7 Hurricane	N7 Collector's Edition Pack or multiplayer

Name	Where to Get
Black Widow	Spectre Requisitions Shop
Collector Sniper Rifle	Retaliation DLC
Javelin	Elkoss Combine Arsenal Supplies Shop; or duing Rannoch: Admiral Koris
Kishock Harpoon Gun	Groundside Resistance DLC
Krysae Sniper Rifle	Firefight DLC
M-13 Raptor	Batarian State Arms Shop; or during Priority: Sur'Kesh
M-29 Incisor	Kassa Fabrication Shop; or during Tuchanka: Bomb
M-90 Indra	Firefight DLC
M-92 Mantis	During Priority: Mars
M-97 Viper	Kassa Fabrication Shop; or during Priority: Palaven
M-98 Widow	Kassa Fabrication Shop; or during Priority: Thessia
N7 Valiant	N7 Collector's Edition Pack or multiplayer

Concentration Mod - Increases damage and speeds perception, enhancing aim for a brief time.
Enhanced Scope - Increases accuracy and helps aim through smoke.
Extended Barrel - Increases damage.
Piercing Mod - Allows bullets to pierce armor at reduced damage. Ignores defense on armored targets.
Spare Thermal Clip - Increases spare shot capacity.

Name	Where to Get
Cobra Missile Launcher	Multiplayer only
Geth Combat Software	During Rannoch: Geth Fighter Squadrons
Geth Spitfire	During both Rannoch: Admiral Koris, and Priority: Rannoch
M-451 Firestorm	During Attican Traverse: Krogan Team
M-560 Hydra	During Tuchanka: Bomb, Priority: Thessia, Priority: Earth, Despoina: Leviathan DLC, and Omega: Aria T'Loak DLC
M-920 Cain	During Priority: Earth
Reaper Blackstar	During Priority: Palaven, Tuchanka: Turian Platoon, and Mahavid: Leviathan DLC
Sync Laser	During Priority: Rannoch

last modified 6 April 2018