Ulterior Observation god roll & best perks

Ulterior Observation — Destiny 2 Machine Gun
Legendary · Machine Gun
Where it drops: Source: Exploring Kepler

“A triptych with three different images. Three different mediums. Three different artists.”

Full perk pool, stats & source for Ulterior Observation →

Built from 120 curated wishlist rolls for this Machine Gun. Perks marked essential appear in every roll of a recommendation; alternatives are the other perks curators call worth keeping.

Recommended rolls

Community wishlist roll

96 wishlist rolls

Inspired by @PodvsEnemies episode 150 from 19 August 2025 (https://open.spotify.com/episode/09YmSx1l928T7hFnj7Kvxi?si=eb827f2ac1974a14) with @CourtProjects, @ImpetusAlways and @Saint_Kabr (PvE PvE-MinorSpec PvE-God PvE-EndGame M+KB Controller): First-choice PvE roll for clearing bulkier adds in both general at-level or better, and end-game underleveled content. Ulterior Observation, as an aggressive frame LMG doesn't really have a frame intrinsic outside of "high damage, high recoil". At base, by comparison with its peers, the stats are decent, benefitting from the boost at Tier 4/5 when barrel and magazine perks are enhanced - d2foundry.gg calculates that 47 Range translates to 29.55m hipfire or 47.28m when ADS before damage drop-off, 46 Stability is ×1.0650 flinch resistance, 45 Handling is 0.39s ready, 0.40s ADS and 0.36s stow speed, 32 Reload Speed is a glacial 5.24s reload and Magazine Size is 60 (max 87). You probably will need a bit of help with the barrel perk to control the recoil. With the magazine perk, maximise the size, use of the combat effect perks or maybe a little more help with the reload speed. For a pretty much all-purpose roll for add clearing, that can also be used for the occasional focusing down of harder enemies, the pairing of Subsistence in the first trait perk column to refill 10% of the magazine (20% when enhanced) from reserves, or Demolitionist to generate grenade energy to use to refill the magazine on a grenade use, either of which can work with Killing Tally for an up to ×1.3 damage boost for killing 3 enemies until you swap or reload or Binary Orbit's ×1.25 damage for 8.5s (10.5s when enhanced) for getting a light-based kill using weapons or abilities. The Exhaustive Research Origin Trait is very good for PvE - ADS for 1s at an enemy up to 60m away, and the next shot will fire a mini-rocket - these are affected by and can proc rocket-based perks and traits too - with a 5s cooldown. Recommended MW: Stability or Handling, with your preferred choice of mod/enhanced mod to boost weapon stats, ammo regeneration, or elemental pickups for builds - and don't forget to check any available seasonal fragile mods.|tags:PvE PvE-MinorSpec PvE-God PvE-EndGame M+KB Controller

Strong alternatives

Killing Tally Polygonal Rifling Subsistence Extended Mag Binary Orbit Demolitionist Appended Mag High-Caliber Rounds Armor-Piercing Rounds Ricochet Rounds Flared Magwell Alloy Magazine Light Mag Arrowhead Brake Fluted Barrel

Community wishlist roll

24 wishlist rolls

Inspired by @PodvsEnemies episode 150 from 19 August 2025 (https://open.spotify.com/episode/09YmSx1l928T7hFnj7Kvxi?si=eb827f2ac1974a14) with @CourtProjects, @ImpetusAlways and @Saint_Kabr (PvE PvE-MinorSpec PvE-God PvE-EndGame M+KB Controller): First-choice PvE roll for clearing bulkier adds in both general at-level or better, and end-game underleveled content, particularly with stasis builds. Ulterior Observation, as an aggressive frame LMG doesn't really have a frame intrinsic outside of "high damage, high recoil". At base, by comparison with its peers, the stats are decent, benefitting from the boost at Tier 4/5 when barrel and magazine perks are enhanced - d2foundry.gg calculates that 47 Range translates to 29.55m hipfire or 47.28m when ADS before damage drop-off, 46 Stability is ×1.0650 flinch resistance, 45 Handling is 0.39s ready, 0.40s ADS and 0.36s stow speed, 32 Reload Speed is a glacial 5.24s reload and Magazine Size is 60 (max 87). You probably will need a bit of help with the barrel perk to control the recoil. With the magazine perk, maximise the size, use of the combat effect perks or maybe a little more help with the reload speed. For Stasis builds, maybe with a double special loadout so this is your primary add-clearing weapon, the combination of Headstone to generate Stasis Crystals on crit kills with Rimestealer to generate Frost Armor stacks for destroying a crystal or frozen target (2 stacks when enhanced) is a tried and tested pairing. The Exhaustive Research Origin Trait is very good for PvE - ADS for 1s at an enemy up to 60m away, and the next shot will fire a mini-rocket - these are affected by and can proc rocket-based perks and traits too - with a 5s cooldown. Recommended MW: Stability or Handling, with your preferred choice of mod/enhanced mod to boost weapon stats, ammo regeneration, or elemental pickups for builds - and don't forget to check any available seasonal fragile mods.|tags:PvE PvE-MinorSpec PvE-God PvE-EndGame M+KB Controller

Essential perks

Headstone Rimestealer

Strong alternatives

Polygonal Rifling Extended Mag Appended Mag High-Caliber Rounds Armor-Piercing Rounds Ricochet Rounds Flared Magwell Alloy Magazine Light Mag Arrowhead Brake Fluted Barrel

What these Ulterior Observation perks do

Killing Tally

Weapon Kills grant a Stack of Killing Tally. Maximum of 3 Stacks. Stowing or reloading the weapon removes all Stacks. Damage increase at 1|2|3 Stacks: • PVE: 10% | 20% | 30% • PVP: 5% | 10% | 15%

Subsistence

Weapon Kills refill 10% of the magazine (rounded up) from reserves. Submachine Gun and Auto Rifle Kills refill 17% of the magazine.

Binary Orbit

Scoring opposing Elemental Alignment Kills grants 25% increased damage for 8.5 seconds. Buff can be activated while stowed. Elemental Alignment details: • Arc, Solar, Void Kills buff Kinetic, Stasis, and Strand Weapons • Kinetic, Stasis, and Strand Kills buff Arc, Solar, and Void Weapons

Demolitionist

Weapon Kills grant 10% Grenade Ability Energy. Kills with Sniper Rifles, Shotguns, Glaives, and Fusion Rifles grant 20%. Using your Grenade Ability refills the Magazine with a 3 second cooldown. Ability energy gained may be significantly decreased based on your selected ability's Chunk Energy Scalar. Learn more about this mechanic in our explainer blog post on the Clarity website.

High-Caliber Rounds

Hits inflict increased Flinch on Enemies. PVE: Tier 1-2 Minors can be repeatedly staggered. Higher Tier Combatants stagger quicker. PVP: Flinch against Players varies based on damage and Weapon Archetype. Flinch increase ranges between 5-10%.

Armor-Piercing Rounds

Grants 5% increased damage against Elemental and Barrier Champion Shields. Allows bullets to overpenetrate enemies once.

Alloy Magazine

Linearly grants a Reload Duration Multiplier as your magazine drops from 50% capacity to empty. Reload Duration Multiplier scales from 0.9x at 50% capacity to 0.8x with an empty magazine.

Headstone

Precision Kills create a Large Stasis Crystal at the target's location. Tier 1-2 Minor and Tier 1 Elite Combatants only spawn a Medium Stasis Crystal. Creating 5 Crystals within ? seconds prevents the perk from activating for 5 seconds.

Rimestealer

Killing Frozen Enemies or Shattering a Stasis Crystal with the weapon grants a Stack of Frost Armor.

Recommendations aggregated from curated community wishlists; credit to the curators linked above.

Ulterior Observation in Destiny 2

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