Pro Memoria - Legendary Machine Gun

Pro Memoria is a Machine Gun Strand Heavy in Destiny 2. Review its base stats, perk pool, and masterwork options.

Weapon overview

Machine Gun - Strand - Heavy - Aggressive Frame

Source: Exploring the Pale Heart

"I'm with you, old man. Whether you like it or not."

High damage, high recoil.

Arrowhead Brake
Lightly vented barrel.
• Greatly controls recoil
• Increases handling speed
Chambered Compensator
Stable barrel attachment.
• Increases stability
• Moderately controls recoil
• Slightly decreases handling speed
Corkscrew Rifling
Balanced barrel.
• Slightly increases range and stability
• Slightly increases handling speed
Extended Barrel
Weighty barrel extension.
• Increases range
• Decreases handling speed
• Moderately controls recoil
Fluted Barrel
Ultra-light barrel.
• Greatly increases handling speed
• Slightly increases stability
Full Bore
Barrel optimized for distance.
• Greatly increases range
• Decreases stability
• Slightly decreases handling speed
Hammer-Forged Rifling
Durable ranged barrel.
• Increases range
Polygonal Rifling
Barrel optimized for recoil reduction.
• Increases stability
Smallbore
Dual strength barrel.
• Increases range
• Increases stability

Extended Mag
This weapon has a greatly increased magazine size, but reloads much slower.
• Greatly increases magazine size
• Greatly decreases reload speed
• Increases airborne effectiveness
Alloy Magazine
Faster reload when the magazine is nearly empty.
Appended Mag
This weapon's magazine is built for higher capacity.
• Increases magazine size
Armor-Piercing Rounds
Rounds cause extra damage to combatants' shields and overpenetrate targets.
• Slightly increases range
High-Caliber Rounds
Shots from this weapon knock the target back farther.
• Slightly increases range
Ricochet Rounds
Rounds ricochet off hard surfaces.
• Increases stability
• Slightly increases range
Flared Magwell
Optimized for fast reloading.
• Slightly increases stability
• Greatly increases reload speed
Light Mag
Improved reload and range.
• Increases reload speed
• Slightly increases range

Envious Assassin
Defeating targets with other weapons before drawing this one transfers ammo to the magazine from reserves. This effect can overflow the magazine based on the number of targets defeated.
Hatchling
Precision final blows or rapidly defeating targets with this weapon spawns a Threadling at the target's location.
Demolitionist
Kills with this weapon generate grenade energy. Activating your grenade ability reloads this weapon from reserves.
Strategist
Final blows with this weapon generate class ability energy. Activating your class ability briefly improves this weapon's stability.
Attrition Orbs
Dealing sustained damage creates an Orb of Power.
To the Pain
While this weapon is equipped, taking damage increases handling and aim assist until the weapon is stowed.

Taking more damage increases the effect.
Reconstruction
This weapon slowly reloads itself over time, up to double capacity.
Tear
Precision final blows cause nearby targets to become severed.
Lucky Shot
Reloading after a precision final blow causes precision hits to refill a round from reserves.

Collective Action
Collecting an Elemental pickup or destroying a Tangle grants this weapon a stacking period of increased damage. Throwing a Tangle provides additional time.

Elemental pickups include [Solar]Firesprites, [Void]Void Breaches, [Arc]Ionic Traces, [Stasis]Stasis Shards, and [Strand]Strand Tangles.
Desperate Measures
Weapon final blows grant bonus damage. Melee and grenade final blows grant a larger damage bonus that can stack.
Target Lock
Damage increases the longer this weapon remains on a target.
Frenzy
Being in combat for an extended time increases damage, handling, and reload for this weapon until you are out of combat.
Dragonfly
Precision kills create an elemental damage explosion.
Tap the Trigger
Grants a short period of increased stability and accuracy on initial trigger pull.
Bait and Switch
Deal damage with all equipped weapons within a short time to give this weapon a damage boost.
Elemental Honing
Dealing unique elemental damage grants this weapon a stacking damage bonus. This bonus is increased for kinetic weapons.
Mega Kill Clip
Reloading after a final blow grants a period of increased damage. Additional final blows before reloading further increases the duration of the damage period.

Dealer's Choice
Final blows with this weapon grant a small amount of Super energy. Equipping multiple weapons from the Pale Heart increases this effect.