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Arcturus Defense Solutions Orbital Strike Designator OSD-1 'Finger of God'

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Arcturus Defense Solutions Microwave Area Denial MAD-3 'Sunburn'

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Arcturus Defense Solutions Magnetic Accelerator Rifle MAR-8 'Longbow'

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Autonomous Swarm Dispersal Unit ASDU-3 'Locust'

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Autonomous Ferrofluid Denial Platform AFDP-2 'Tidemark'

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Autonomous Adhesive Denial Drone AADD-2 'Barnacle'

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Axiom Systems Biometric Lock Rifle BLR-3 'Personal'

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Autonomous Swarm Dispersal Unit ASDU-4 'Locust'

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Axiom Systems Cognitive Grenade CG-1 'Brainstorm'

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Axiom Systems Perception Filter Rounds PFR-1 'Blind Spot'

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Axiom Systems Synapse Interruptor SI-3 'Stutter'

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Axiom Systems Cortical Bomb CB-1 'Leash'

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Ballistic Resonance Carbine BRC-6 'Kettledrum'

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Bioelectric Induction Lance BIL-3 'Lamprey'

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Biophotonic Retinal Cascade Emitter BRCE-5 'Flashpoint'

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Catalytic Aerosol Mortar CAM-3 'Lungful'

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Catalytic Vapor Dispersal Charge CVDC-5

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Cavitation Pulse Carbine CPC-2 'Bends'

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Catalytic Interstitial Desiccation Drone CIDD-3 'Husk'

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Catalytic Spore Dispersal Drone CSDD-3 'Mulch'

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Cavitation Pulse Knuckles CPK-5 'Bloodwater'

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Cochlear Resonant Hemorrhage Projector

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Coherent Thermal Excitation Rifle CTER-7 'Ashmaker'

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Coherent Radiation Scalpel CRS-7 'Suture'

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Corneal Piezoelectric Delamination Pistol

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Cryogenic Dendrite Scatter Cannon CDSC-4 'Frostbite'

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Counter-Personnel Loiter Munition CPLM-7 'Patience'

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Crystalline Synovial Pressure Rifle CSPR-2 'Kneemaker'

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Cryogenic Pressure Emitter CPE-2 'Frostbite'

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Dielectric Filament Anchor Drone DFAD-1 'Cobweb'

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Dielectric Phase Inversion Glove DPIG-4 'Secondskin'

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Electrochemical Dissolution Sprayer EDS-2 'Lacquer'

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Directed Overpressure Charge

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Directed Oxidation Lance DOL-3 'Rustmaker'

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Electrokinetic Pulse Drone EPD-3 'Thunderhead'

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Electrochemical Vapor Seeding Drone EVSD-4 'Rainmaker'

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Electrolytic Bone Density Projector EBDP-4 'Chalk'

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Electrostatic Adipose Polarization Drone EAPD-2 'Render'

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Electromagnetic Overpressure Charge EOC-8

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Electrostatic Dermal Adhesion Projector

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Electromagnetic Pulse Grenade EPG-5 'Deadstop'

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Electrothermal Chemical Carbine ETCC-5 'Flashpoint'

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Electrothermal Compression Lance ETCL-9 'Ironlung'

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Electrostatic Needle Array Rifle ENAR-3 'Porcupine'

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Electrostatic Flensing Projector EFP-1 'Skinreader'

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Endolymphatic Pressure Cascade Rifle

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Endothermic Synovial Disruption Rifle ESDR-1 'Lockjaw'

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Endocrine Cascade Volatilization Lance ECVL-5 'Burnout'

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Ferroelectric Shatter Sidearm FESA-2 'Gravel'

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Ferrofluid Induction Cannon FIC-6 'Ironbloom'

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Ferrofluid Dermal Infiltration Drone FDID-6 'Ironblush'

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Entropic Dielectric Pulse Emitter EDPE-5 'Candle'

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Galvanic Myofibril Lash

melee

Galvanic Marrow Projector GMP-1 'Marrowbone'

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Galvanic Interstitial Fluid Displacement Lance

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Galvanic Disruption Gauntlet GDG-2 'Palsy'

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Galvanic Periosteal Fatigue Emitter GPFE-4 'Hairline'

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Galvanic Vapor Diffusion Pistol GVDP-1 'Saltlick'

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Gauss Flechette Repeater GFR-3 'Needlerain'

firearm

Gravimetric Induction Pistol GIP-4 'Undertow'

energy

Crucible Industries Breaker BA-4 'Doorknocker'

A break-action scatter shotgun designed for close-quarters hallway fighting in GLMZ's compressed urban corridors. The BA-4 uses a traditional break-action mechanism machined from Ablonite-KR ceramic composites, making it virtually immune to electromagnetic interference and impossible to disable with standard EMP grenades. The barrel is short — just 28 centimeters — and the bore is wide enough to accept a variety of improvised loads in addition to its standard flechette shells.

Crucible Industries markets the Doorknocker as a breaching tool rather than a combat weapon, a legal distinction that allows it to be sold at Tier 2 without heavy weapons licensing. In practice, every corridor fighter and close-quarters operative in GLMZ knows the BA-4 for what it is: a devastatingly simple weapon that turns tight spaces into kill zones. The break-action mechanism means a maximum of two shots before reload, which has given rise to the street saying 'two knocks and you're done.'

The weapon's Ablonite-KR receiver has an unexpected secondary benefit — the ceramic composite is extremely resistant to forensic trace analysis, making it difficult for investigators to match fired projectiles to a specific weapon. Crucible claims this is incidental to the material choice. Nobody believes them.

CRUCIBLE INDUSTRIES → Crucible Genomics

name

Crucible Industries Breaker BA-4 'Doorknocker'

aliases

Doorknocker
BA-4
The Breaker
Knock-Knock

category

melee

manufacturer

CRUCIBLE INDUSTRIES

tier availability

Tier 2+

legality

Licensed as breaching tool — effectively unrestricted

base technologies

Ablonite-KR ceramic composite construction
Wide-bore break-action mechanism
Multi-load compatible chamber

specifications

gauge: 10-gauge wide bore
effective_range: 2-15 meters
rate_of_fire: 2 shots, manual reload
capacity: 2-round break-action
weight: 2.8 kg
barrel_length: 28 cm
load_compatibility: Standard flechette, slug, improvised

tactical use

The Doorknocker excels in hallway and room-clearing scenarios where its wide spread pattern fills confined spaces. Operators typically carry pre-loaded spare barrels for rapid reload rather than fumbling with individual shells. The weapon's EMP immunity makes it a reliable backup when electronic weapons fail during infrastructure attacks. Two-person teams alternate shots to maintain continuous threat coverage.

cultural context

In GLMZ's lower tiers, the BA-4 is the most commonly encountered serious weapon — cheap enough to acquire, simple enough to maintain, and devastating enough to end most confrontations in a single trigger pull. Street culture has adopted 'knocking' as a euphemism for armed robbery, and the distinctive crack of a break-action closing has become an auditory threat signal recognized across all tiers. Crucible's attempt to market it as a tool has become a running joke.

known users

Lower-tier corridor fighters
Breaching teams across all tiers
Improvised militia groups

story hooks

A batch of BA-4s has appeared with barrels bored out to accept 8-gauge shells — the resulting weapon is barely controllable but absolutely lethal in confined spaces. Someone is modifying them in bulk.
A Crucible Industries quality control engineer has discovered that a specific production run of Ablonite-KR receivers contains a traceable isotopic signature — contradicting the company's claims about forensic resistance.

ammunition type

10-gauge flechette shell
10-gauge slug
improvised loads

related entities

Brecken Yılmaz-Osei
Dredge Mining Collective ThermoVault GX-3 Geothermal Tap System
GLMZ
Kang-Petrov Arms KPS-410 'Hallway'
Street Custom 'Glass Garden' Caltrops
TESSERA PG-2 'Signature'
TESSERA TC-3 'Crucible'
The Composite Index

physical description

visual profile	A brutally utilitarian break-action shotgun with a stocky, wedge-shaped profile. The receiver dominates the design — a massive, sculptural ceramic block that tapers toward a surprisingly short barrel. The silhouette reads as compact and aggressive, all business with zero aesthetic concession. Looks like a tool designed by someone who'd used it.
dimensions	Overall length: 58 cm \| Barrel length: 28 cm \| Receiver width: 8.5 cm \| Height (top of hammer to bottom of grip): 16 cm
weight description	Hefty but balanced. The 2.8 kg mass sits predictably in the hand — not unwieldy despite the wide receiver, because the weight is concentrated and compact. Feels purposeful, like holding a breach hammer that happens to shoot.
primary material	Ablonite-KR ceramic composite for the receiver and breech block. Steel internal mechanisms (hammer, trigger bar, sear). Reinforced polymer foregrip and stock sections. The barrel is chrome-lined steel.
finish	The ceramic receiver has a matte, slightly grainy surface — unsealed Ablonite-KR, deliberately left to show micro-fractures and wear. Not polished. The steel internals show functional wear — smudged chrome with darkened edges where fingers grip. Overall impression is anti-gloss: designed to not reflect light in tactical situations.
color scheme	Primary: industrial grey-white (the Ablonite-KR ceramic, slightly off-white with shadow grain). Steel internals show dark gunmetal. Polymer grip sections: matte black. Minimal contrast — the weapon merges into industrial environments.
grip texture	Rough, aggressive polymer with deep horizontal grooves. Textured to bite even through gloves. The trigger guard is sharp-edged, unapologetic. Metal hammer spur is bare, unpadded.
distinctive features	Oversized, flat-topped ceramic receiver block with visible surface micro-fractures Prominent top-mounted hammer with deep knurling Wide, gaping breech opening when action is open — looks like a yawning mouth Short, fat barrel with visible chrome bore Functional wear patterns on ceramic where the action cycles No rail systems, no accessory mounting — pure mechanical design Stamped steel reinforcement bands around the receiver at hammer pin and breech Minimal trigger guard, just a sharp bracket Serial number etched into ceramic in small block text, almost invisible unless you know where to look
manufacturer markings	CRUCIBLE INDUSTRIES stamped in small serif letters on the left side of the ceramic receiver, positioned low. 'BA-4 DOORKNOCKER' engraved directly below in utilitarian block letters. Below that: 'BREACHING TOOL — NOT FOR MILITARY USE' (legal boilerplate). No logo flourish — all text is purely functional, industrial lettering.
condition typical	Well-maintained but visibly used. The ceramic receiver shows fine scratches and micro-cracks from repeated cycling and field contact. The steel internal parts show light oxidation from humidity exposure. Grip polymer has scuff marks from holstering and extraction. Everything points to regular use by someone who respects the weapon but doesn't baby it. The breech block has faint carbon residue around the edges from shell ejection.

image prompt

Product photograph of the Crucible Industries BA-4 Doorknocker break-action shotgun, positioned at 45 degrees on a matte gunmetal grey surface. Dramatic side-lighting from upper left, casting sharp shadows that emphasize the blocky ceramic receiver and hammer geometry. The weapon is being held in a gloved tactical hand (black leather, visible wear) gripping the foregrip. Close-up detail showing the oversized ceramic receiver with its grainy, micro-fractured texture clearly visible. Chrome barrel reflecting narrow light lines. Ablonite-KR ceramic in cool industrial grey-white. Steel internals showing functional wear and dark patina. Background is soft black, keeping focus on the weapon's brutal geometry and material contrasts. Neo-noir urban aesthetic: cold, utilitarian, forensically designed. Moody and tactical, no chrome or excessive detail — pure function. --ar 3:2 --v 6

visual prompt