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Crucible Industries Storm Carbine SC-4 'Downpour'

The SC-4 Downpour is Crucible Industries' entry into the high-rate-of-fire carbine market, designed for shipboard security and close-quarters facility defense. Chambered in 4.6mm high-velocity caseless, the Storm Carbine fires at a blistering 1,100 rpm from a 50-round drum magazine. The small caliber and frangible ammunition are engineered to defeat soft body armor while fragmenting against bulkheads and hull plating, minimizing the risk of catastrophic breaches in pressurized environments.

The SC-4's recoil management system uses a counterweight bolt carrier that moves in opposition to the bolt, canceling felt recoil to a degree that allows controllable automatic fire from an unsupported standing position. BCI integration is optional — the weapon functions identically with or without a smart-link, though neural fire-control improves hit probability by approximately 15% at full auto.

Crucible partnered with several orbital station operators and maritime security firms to develop the Downpour, and it shows in every design decision. Short overall length. Frangible-optimized barrel twist. Hull-safe ammunition. This is a weapon designed for fighting inside things you don't want to destroy.

CRUCIBLE INDUSTRIES → Crucible Genomics

name

Crucible Industries Storm Carbine SC-4 'Downpour'

aliases

Downpour
SC-4
Storm Gun

category

assault_rifle

manufacturer

CRUCIBLE INDUSTRIES

tier availability

Tier 3+

legality

Restricted — licensed security

base technologies

Counterweight recoil cancellation
Frangible ammunition optimization
Hull-safe terminal ballistics

specifications

caliber: 4.6mm HV caseless frangible
effective_range: 200m
rate_of_fire: 1,100 rpm (cyclic)
magazine_capacity: 50 rounds (drum)
weight: 2.8 kg

tactical use

The SC-4 dominates close-quarters engagements in confined spaces. Its extreme rate of fire and manageable recoil allow operators to saturate tight corridors and compartments with frangible projectiles that shred soft targets while sparing structural elements. Boarding actions, facility clearing, and shipboard defense are its primary roles. Beyond 200 meters the small frangible rounds lose effectiveness rapidly.

cultural context

The Downpour is a specialist weapon that has found an unexpected civilian following among Tier 3+ sport shooters who appreciate its controllability and the visceral experience of dumping 50 rounds in under three seconds. Crucible has capitalized on this with a civilian semi-auto variant, though the full-auto version remains restricted. In orbital communities, the SC-4 is standard issue for emergency response teams.

known users

Orbital station security
Maritime boarding teams
Facility defense forces
Crucible corporate security

story hooks

During a station emergency, the security team's SC-4 frangible rounds failed to fragment — someone loaded standard penetrator ammunition into the magazines, and every missed shot risks hull integrity.
A pirate crew has modified their Downpours to fire armor-piercing rounds, negating the weapon's hull-safe design for use in aggressive boarding actions.

ammunition type

4.6mm HV caseless frangible
4.6mm HV caseless standard

related entities

Carrion Defense Works Suppression Collar SC-4
Crucible Industries Storm Platform CP-8 'Deluge'
Ebele Medina-Quaye
Kang-Petrov Arms KP-22 Sport 'Plinkmaster'
Lazarus Pharmaceuticals Splanchnic Triage Automaton
Nika Svensson-Kone
TESSERA TC-3 'Crucible'

physical description

visual profile	A compact, brutalist assault carbine with aggressive angularity. The SC-4 reads as purpose-built industrial—all business, minimal aesthetic flourish. Short stocky profile with a pronounced drum magazine that dominates the lower receiver. The counterweight system creates a slightly bulbous, asymmetrical look to the bolt carrier housing. Optical rail runs the full length of the upper receiver.
dimensions	Overall length: 58 cm \| Barrel length: 22 cm \| Magazine height adds 12 cm \| Width (magazine): 8.5 cm
weight description	Surprisingly balanced despite 2.8 kg weight. The counterweight system and drum magazine placement create a forward-neutral center of gravity. Hefty enough to feel substantial but not unwieldy—designed for one-handed control during dynamic movement through tight spaces.
primary material	Aluminum alloy 7075-T6 upper receiver. Polymer-reinforced magnesium lower frame. Steel barrel with hydrogen-embrittlement treatment for frangible round compatibility.
finish	Hardcoat anodized matte gunmetal gray on aluminum surfaces. Parkerized steel components with light oxidation patina. Polymer sections feature a fine-grit textured finish—non-reflective, industrial.
color scheme	Gunmetal gray primary with matte black polymer accents. Stainless steel feed lips and chamber wear-ring create silver highlights. Optional safety selector and mag release in burnt orange anodize for quick target acquisition in low-light conditions.
grip texture	Rubberized pistol grip with vertical ridging for pressure-suited gloves. Fore-end features wraparound textured polymer—tacky to touch, engineered for movement in zero-g or pitch corridors. Charging handle has knurled steel inlays.
distinctive features	Exposed counterweight bolt carrier with visible piston rods running parallel to barrel Drum magazine with witness holes and numbered round count (5-round increment markers) Integrated ejection port shroud to contain frangible round fragmentation debris Short Picatinny rail sections with QD hard-points at 45-degree intervals Muzzle device with four symmetrical expansion ports—designed for frangible round energy dispersal Pressure-relief vents machined into the upper receiver body Faint laser-etched serial numbering on lower receiver with safety-cert hologram Magazine release lever reinforced with additional polymer gusset
manufacturer markings	CRUCIBLE INDUSTRIES corporate logo (interlocking C and I in a gear) stamped on charging handle. SC-4 'DOWNPOUR' designation laser-marked on dust cover in clean sans-serif. 4.6mm HV FRANGIBLE / HULL-SAFE stamped on barrel in small letters. License plate on magazine identifying as Tier 3+ restricted armament.
condition typical	Field units show micro-scratches on aluminum surfaces and slight bluing loss on steel components. Polymer shows minor scuff marks from equipment rack storage. Dust covers rarely pristine—operational carbines accumulate salt spray or coolant residue from shipboard/station environments. Maintenance-conscious operators keep feeds and ejection ports meticulously clean.

image prompt

Product photography of the Crucible Industries Storm Carbine SC-4 Downpour, sleek compact assault carbine with 50-round drum magazine. Weapon mounted horizontally on dark brushed steel surface, dramatic side-lighting with cool blue-white highlights accentuating the aluminum upper receiver and counterweight bolt carrier housing. Gunmetal anodized finish catching sharp edge-light. Matte black polymer accents receding into shadow. Stainless steel magazine witness holes faintly glowing. Close tactical detail of the muzzle device and rail system. Neo-noir urban aesthetic—industrial, utilitarian, pressure-vessel design language. Minimal accessories. Dark studio backdrop. Professional armory catalog lighting. --ar 3:2 --v 6

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