Shells / Thief Build / BRRT SMG

Best Marathon Thief BRRT SMG Build — Season 2 Loadout

A complete Marathon Thief loadout built around the BRRT SMG — weapon mods, shell cores, implants, and a Cradle stat-track plan — engineered from the Thief’s playstyle and cross-referenced against real in-game stat values. See the full Thief build hub and the BRRT SMG stats behind these picks.

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SHOWING VERIFIED CANONICAL
GOAL
RANK TARGET
EXPERIENCE
WEAPON PREFERENCE
TEAM
BUILD REPORT
Ghost Dividend
Burst onto targets using Grapple Device for aggressive positional flanks, dump BRRT SMG mag at point-blank, then vanish before the engagement becomes a sustained fight. X-Ray Visor pre-identifies high-value inventory targets so every engagement is deliberate — you choose your mark, strip their loot via Pickpocket Drone hook, and exfil before anyone can retaliate.
A
LOADOUT GRADE
RANKED VIABLE
Weapons
BRRT SMG
PRIMARY
Runner's explicit preference, and the stats suit the playstyle well: 11 damage per round at 1000 RPM across a 45-round magazine gives substantial sustained burst output at CQB range — exactly where Grapple Device deposits you. The high magazine size means you can empty a full TTK window without reloading mid-engagement, which is critical for hit-and-run since you need to finish fast and disengage before return fire organizes.
Magnum MC
SECONDARY
The Magnum MC hits 41 damage per shot at 138 RPM in the Mid range band, filling the gap when you are caught outside CQB or need a high-damage single-trigger response without committing to a full SMG engagement. Two body shots plus one headshot interaction can delete targets at ranges where the BRRT loses effectiveness, and its Heavy Rounds ammo pool does not compete with the BRRT's Light Rounds, keeping resupply options independent.
Weapon Mods
BARREL
Flechette Split Action
This is the BRRT SMG's dedicated Prestige barrel mod. It increases stability, handling, and accuracy when firing from the hip — critical for a hit-and-run build that regularly dumps mag immediately after a Grapple landing without time to fully ADS. Hip-fire accuracy on a 1000 RPM SMG is otherwise a liability; this mod directly addresses that weakness and keeps the damage concentrated during the entry burst.
CHIP
See Ya
Reloading on an empty magazine triggers a brief invisibility window. For a hit-and-run Thief, this is the single best chip available: you dump your 45-round mag, the engagement ends, and reloading immediately cloaks you for the disengage. The timing is natural — an empty reload is exactly when you are most exposed, and the invisibility buys the seconds needed to Grapple away or break line of sight. Exact duration is unconfirmed, but the mechanic is perfectly suited to this exit strategy.
MAGAZINE
Hi-Cap Mag
Sources list this at +9 magazine size, bringing the BRRT from 45 to approximately 54 rounds. Against a solo target this is academic, but against multiple contacts or a target that requires more than one burst to down, that buffer prevents the scenario where you are caught mid-reload at close range. The tradeoff note of increased reload time (per Drum Magazine description pattern) is mitigated by See Ya's empty-mag invisibility, making the larger magazine synergize directly with the chip choice.
GRIP
Snapshot Grip
Slightly increases accuracy while moving and ADS speed. The BRRT is a CQB weapon used on the move, and this Enhanced grip chips in both stats that matter for the grapple-in, fire, grapple-out loop. It is not the flashiest choice but it is the correct one — every bit of accuracy-while-moving retention on a 1000 RPM weapon reduces wasted rounds during the entry sprint.
Shell Cores
Hit and Run
TACTICAL
The name alone could not be more on-brand, but the mechanic is the reason: striking a target immediately after grappling Hacks them AND knocks random loot items from their backpack. This directly chains the Grapple Device into the Thief's extraction identity — you arrive, you Hack, you strip loot, you shoot, you leave. It collapses the Pickpocket Drone loot step into the melee-grapple entry, saving the drone for scouting or secondary targets.
Hideout
PRIME
While piloting the Pickpocket Drone you become invisible. For a solo runner with no squad cover, this is survival insurance during the most vulnerable window of the loop — when you are stationary piloting the drone to hook high-value loot. It also enables aggressive drone positioning: park it deep in contested space, go invisible, hook items, retrieve, and relocate without ever exposing your physical shell.
Crime Spree
PASSIVE
Each container opened increases Loot Speed, resetting only on down. For a hit-and-run solo runner, this compounds throughout the run — early-game container farming snowballs into late-game extraction speed that dramatically shrinks the window you spend exposed while looting. This directly serves the extraction priority and pairs with the aggressive early movement of the build.
Implants
HEAD
Sprint Kit V2
Loot Speed: 10%, Agility: 10, Fall Resistance: 10%
Agility +10 and Loot Speed +10% in a single Enhanced slot is exceptional value for this playstyle. Agility directly translates to movement speed, which is the Thief's primary survival tool — faster baseline movement means Grapple Device launches you further and your repositioning between engagements is tighter. Loot Speed reinforces the extraction half of the hit-and-run loop. Fall Resistance +10% has incidental synergy with aggressive Grapple usage from height.
LEGS
Graceful Landings V4
Agility: 20, Melee Damage: 20, Fall Resistance: 50%
Agility: 20, Melee Damage: 20, Fall Resistance: 50% — and the Frenzy Matrix passive: defeating a hostile increases tactical recharge rate and sprint speed for a short time. For a build centered on Grapple Device as a mobility and entry tool, Fall Resistance 50% is nearly mandatory — aggressive grapple angles involve significant drop height. The Frenzy Matrix passive directly shortens Grapple Device cooldown after each successful kill, enabling faster re-engagement or escape repositioning. Agility +20 stacks with Sprint Kit V2 for meaningful total movement gain.
TORSO
Nimble Fingers V2
Loot Speed: 25%, Agility: 5
Loot Speed +25% is the single largest Loot Speed value available in the Torso slot at Enhanced tier and directly serves the extraction half of this build. Combined with Sprint Kit V2's +10% and Crime Spree's stacking bonus, looting becomes near-instant in the mid-to-late run. Agility +5 is a small additional movement bonus. The Ballistic Resistance passive reduces incoming UESC ballistic damage, which is a meaningful buffer for a solo runner with no squad to absorb pressure.

Thief Cradle Build — Season 2 Stat Plan

Free respec · resets each season
Primary investment in Dexterity for Agility and Loot Speed scaling, with secondary investment in Recharge to reduce Grapple Device and Pickpocket Drone cooldown windows — the two mechanics this entire build revolves around.
DEXTERITY TRACK
14 ENERGY
PERK · Full Throttle
Full Throttle at 14 Energy gives Cardio Kick effects at the start of every run, meaning you have boosted movement from the first second of deployment. The path through Loot Siphon (5 Energy — opens containers grant Tactical energy, directly charging Grapple Device faster early-game) and Slider (11 Energy — sliding generates less heat, enabling aggressive sprint-slide repositioning without heat penalty) means every breakpoint along this track serves the hit-and-run identity before you reach the capstone. All values are source-listed as unconfirmed but the mechanical fit is exact.
RECHARGE TRACK
4 ENERGY
PERK · Head Start
Even a modest 4 Energy investment in Recharge gives Head Start — starting runs with partial Tactical charge means Grapple Device is available from the first engagement rather than on cooldown. For a solo runner whose entire entry and escape plan depends on Grapple Device being online, this is high-priority early spend. If budget allows, pushing to Primed (10 Energy) also provides partial Prime charge for Pickpocket Drone at run start, completing the ability readiness picture. Values are unconfirmed per source listing.
STRENGTHS
+Grapple Device entry chained into Hit and Run core strips loot AND Hacks targets simultaneously, compressing the engagement timeline to seconds
+See Ya chip converts empty-mag reload into an invisibility window, giving a natural disengage trigger that requires zero additional input
+Stacked Loot Speed from Nimble Fingers V2 (+25%), Sprint Kit V2 (+10%), and Crime Spree (stacking passive) means extraction looting is near-instant by mid-run
WEAKNESSES
120 base HP with no shield means prolonged fights against multiple enemies or any sustained damage trade will end badly — the build has no comeback mechanics outside positioning
BRRT SMG's CQB range rating means any engagement where you cannot close distance via Grapple Device puts you at a significant DPS disadvantage against mid-to-long range loadouts
RANKED NOTE
Casual play with no ranked constraints — this build is optimized purely for effectiveness and fun; the Shell carries a Solo S ranked rating which means if you do queue ranked, the Thief's extraction ceiling is genuinely competitive at solo brackets.
⬢ Build Analysis
Ghost Dividend is built around a three-second violence window. You Grapple in, the Hit and Run core triggers a melee Hack that simultaneously strips backpack loot, you dump the BRRT's 45-round mag (extended to roughly 54 with Hi-Cap Mag per source listings) at 1000 RPM into whatever is in front of you, and you reload on empty — which See Ya converts into an invisibility cloak for the exit. The entire engagement from landing to invisible is under five seconds if you execute cleanly. Flechette Split Action is non-negotiable on the BRRT for this loop: hip-fire accuracy on a 1000 RPM weapon immediately after a grapple drop determines whether your burst concentrates or scatters, and this is the only barrel mod purpose-built for this weapon. The implant stack — Graceful Landings V4's Frenzy Matrix passive cutting Grapple cooldown after each kill, Sprint Kit V2's Agility +10, and Nimble Fingers V2's Loot Speed +25% — means the build genuinely accelerates as the run progresses. Hideout keeping you invisible while droning and Crime Spree compounding loot speed means your extraction value scales with aggression, not despite it. This is a build that rewards decisiveness: commit to the entry, finish fast, vanish.
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