SUROS pays you twice for emptying the mag: the bottom half hits harder, and kills in it heal you. So the whole build is a machine for keeping the mag bottomed-out and refilling on command. Speedloader Slacks turns every dodge into an instant full reload, On Your Mark ramps Weapons stat off the precision hits you're already landing, and Solar's heal verbs cover the gaps SUROS's own health-on-kill can't. Hold the trigger, dodge to top up, never stop firing.
The weapon
SUROS Legacy (exotic perk):"The bottom half of each magazine deals bonus damage and has a chance to return health on kill."
SUROS Ascendance (catalyst):"Increased chance for kills to regen health."
SUROS Regime is a Kinetic-slot Auto Rifle firing Primary ammo, so it's ammo-unconstrained — you can spray it forever. The exotic splits each magazine: the bottom half is the payload, dealing bonus damage and rolling for a health proc on every kill. The catalyst raises that proc chance, turning the bottom half into a self-healing sustain window. The implication for the whole build: you want to be in the bottom half as often as possible, and you want a way to refill the top half instantly so you can re-enter that window on demand instead of waiting out a normal reload. That refill is the build.
Loadout
Slot
Pick
Why
Subclass
Gunslinger (Solar)
On Your Mark ramps Weapons stat off SUROS's precision hits; Solar heal verbs backstop SUROS's own health-on-kill.
Super
Golden Gun: Marksman
On-theme single-target delete for anything SUROS can't chew; precision kills make Orbs (feed Speedloader/On Your Mark uptime).
Class ability
Marksman's Dodge
Reload on dodge stacks with Speedloader's instant reload — and the dodge is what triggers Speedloader at all.
Melee
Lightweight Knife
Precision-kill loop for Radiant via Ember of Torches/On Your Mark; cheap, keeps you shooting.
Grenade
Healing Grenade
Restoration on demand — the heal SUROS's RNG proc can't guarantee in a pinch.
Aspect 1
On Your Mark
Precision hits (or class ability) grant +Weapons stat and reload ×10; max stacks give Restoration (9.7.0). SUROS feeds the stacks for free.
Aspect 2
Knock 'Em Down
Marksman Golden Gun gets increased duration; enhances the Super you'll lean on for champions/bosses.
Fragments
Ember of Torches, Ember of Empyrean, Ember of Solace, Ember of Singeing
Radiant from melee (Torches) → Solar-weapon kills extend Radiant/Resto (Empyrean) → longer duration (Solace) → class-ability regen on scorch (Singeing) feeds the dodge.
Exotic armour
Speedloader Slacks (Legs)
Dodge instantly reloads all weapons + reload/handling buff (×5 stacks); sustained damage grants class-ability energy — SUROS's constant fire refunds the dodge that refills SUROS.
Energy weapon
A Solar Special (e.g. Solar shotgun/sniper)
Keeps Empyrean's Radiant/Resto extension rolling and gives a burst option; matches the surge you'll run.
Heavy
Machine Gun or a heavy of choice
Boss/heavy-major damage SUROS isn't built for; pick to match champion/surge needs.
Why this works (the mechanics)
The dodge is the bottom-half button. SUROS rewards being in the bottom half of the mag. Normally you'd have to burn the whole mag and eat a full reload to get back there. Speedloader Slacks reloads the entire weapon instantly on dodge, so you can fire into the bottom half, dodge to refill the top, and immediately spray back down into the bonus-damage window — the bottom half becomes effectively most of your trigger time.
The build is a closed loop with no cooldown to babysit. Speedloader's "sustained damage grants class-ability energy" is fed by SUROS doing exactly one thing — holding the trigger. So spraying refunds the dodge, the dodge refills SUROS and re-arms the bottom-half window, and the reload/handling buff stacks ×5 on repeat dodges. Marksman's Dodge and On Your Mark both add more reload on top, but the engine self-sustains off gunfire alone.
On Your Mark double-dips with the 9.7.0 Weapons stat. Landing precision hits (which SUROS does by the dozen) stacks On Your Mark ×10, each stack adding Weapons stat — and post-9.7.0 the Weapons stat is a flat PvE damage multiplier vs minors/majors. So SUROS's own precision fire ramps a damage buff that stacks on top of the bottom-half bonus. Two multiplier sources from one trigger pull, and max stacks hand you Restoration.
Three-layer sustain makes a Primary feel like a tank. SUROS's health-on- kill (catalyst-boosted), On Your Mark's max-stack Restoration, and Healing Grenade overlap so that emptying the bottom half into a pack passively keeps you topped — Ember of Empyrean then extends the Radiant/Resto every time the Solar Special gets a kill, and Ember of Solace lengthens both. The gun that needs you to stand and spray gives you the survivability to do it.
Radiant is a free damage layer the loop already produces. Lightweight Knife precision kill → Ember of Torches Radiant (+ weapon damage) → SUROS kills under Radiant extend it (Empyrean). Radiant stacks with the bottom-half bonus and On Your Mark, so the spray window is buffed by three independent sources at once.
Scorch closes the ability economy. Ember of Singeing regenerates the class ability faster when you scorch (Golden Gun/Solar Special scorch) — a second feed for the dodge beyond Speedloader, so the bottom-half window is never gated on cooldown.
Stats & mods
Weapons 200 → Health 100+ → Class. Weapons is the priority: it scales SUROS's per-shot PvE damage and is exactly what On Your Mark piles onto. Health 100+ keeps you alive between heal procs; Class fuels the dodge that runs the whole loop (Speedloader + Marksman's Dodge + reload stacks).
Mods: Auto Rifle Loader and Auto Rifle Reserves/Scavenger on arms/legs (faster reloads compound with Speedloader; deeper reserves = more spray), Kinetic/weapon Surge ×2-3 on legs for flat SUROS damage, Heavy/Special Finisher and Font mods to hit the stat targets above.
Stat tuning: +Weapons / −(dump) tuning mods to push Weapons toward 200; trade Grenade or Super down since this build leans on the gun, not throws.
Archetypes: prioritise pieces favouring Weapons (and Class for the dodge) — e.g. Gunner/Powerhouse-style rolls.
Where it shines
Add-clear and red-bar density — sustained Primary spray with built-in heal is tailor-made for endless waves: Onslaught, GM lost-sector trash, Nightfall add phases, seasonal horde activities. You out-sustain the room.
Champions: SUROS has no bespoke champion stun, and as a Kinetic Auto Rifle it carries no intrinsic archetype stun either. Run the artifact's Anti-Barrier Auto Rifle (stuns Barrier and overcharges Auto Rifles) to make SUROS your Barrier answer; Marksman Golden Gun deletes a stunned Unstoppable/Overload or a Barrier on cooldown. Bring a secondary frame for whichever champion type the artifact slot doesn't cover.
Survivable mid-tier endgame — Legend/Master content where you can stand in the bottom-half window and let the heal layers carry you. For raw boss DPS, swap to the Heavy/Golden Gun; SUROS is the engine, not the burst.
Mod selection (masterworked — full allocation)
Piece
Mod · cost
What it does
Helmet (7/10)
Solar Siphon3efill
Rapid Solar weapon final blows create an Orb of Power.
Ashes to Assets3efill
Gain bonus Super energy on grenade kills.
Heavy Ammo Finder1efill
Increases the effect of all contributions towards the Heavy ammo meter.
Arms (8/10)
Weapon Loader (faster reload)3e
Utility Kickstart3efill
When your class ability energy is fully expended, your Armor Charge is consumed and you gain class ability energy for each Armor Charge used.
Momentum Transfer2efill
Causing damage with a grenade reduces your melee cooldown.
Chest (6/10)
Solar Resistance2efill
Reduces incoming Solar damage from combatants.
Concussive Dampener3efill
Reduces incoming area-of-effect damage from combatants.
Sniper Damage Resistance1efill
Reduces incoming damage from combatants that are at long range.
Legs (3/10)
Solar Scavenger1e
Solar weapons get bonus reserves when picking up ammo used by that weapon.
Solar Weapon Surge1e
Your Solar weapons gain a small bonus to damage while you have any Armor Charge. Your Armor Charge now decays over time.
Solar Weapon Surge1e
Your Solar weapons gain a small bonus to damage while you have any Armor Charge. Your Armor Charge now decays over time.
Class Item (3/10)
Special Finisher1e
Finishers generate Special ammo for the whole fireteam.
Reaper1efill
Shortly after using your class ability, your next weapon final blow spawns an Orb of Power.
Bomber1efill
Reduces grenade cooldown when using your class ability.
All 15 sockets used, 10 energy per masterworked piece; costs from the manifest. Core mods are the build's engine; fill mods are strong defaults — swap freely (chest resists should match the activity's damage types). Flex/loadout-dependent: Font mods to hit the stat targets above. - **Stat tuning:** +Weapons / −(dump) tuning mods to push Weapons toward 200; trade Grenade or Super down since this build leans on the gun; not throws. - **Archetypes:** prioritise pieces favouring **Weapons** (and Class for the dodge) — e.g. Gunner/Powerhouse-style rolls.