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@Maugan Ra.
Gunmetal City
Gunmetal City is built into the crater of Mount Thollos, an immense volcano on the north coast. Given the limits placed by the crater, the city is built upward, the spire made of sky-piercing towers constantly being scrubbed clean by hordes of servants. Clean air is the privilege of nobility, the richest outright importing fresh air from other worlds for their mansions.
The middle hive here is completely defined by the gargantuan foundries churning out an incessant flood of weapons and munitions crucial to Imperial war efforts. The Infernis, the under-hive equivalent, is consumed by unbearable heat, and spouts of lava and toxic gas from Mount Thollos. The gangers of Infernis have nothing to live for other than dominating other gangs, and these well-armed maniacs produce the best soldiers in the PDF and tithed Imperial Guard regiments.
Bloody Lucre
In theory, business in Gunmetal City is straightforward. There are contracts with private buyers, direct purchases by Battlefleet Calixis and the Departmento Munitorum, and the biggest prize: consignments to the Administratum as part of the tithe. The producers deliver directly to the Administratum on behalf of the Lord Governor, and the Lord Governor reimburses them in turn. The "Exactors" (as the Administratum adepts are called for their suspiciously precise numbers) make sure everything is running smoothly and publish the next set of quotas at the proper time. The Mechanicus oversee the machines in every foundry and tightly control the dispensation of archprints and rites of forging.
In practice, people will do near anything to get those commissions. Bribery, intimidation, sabotage, and assassinations are rife. The Arbites don't care about what the nobles do to each other, but come down with maximum force and zero subtlety on corruption in the Adeptus or anything that could threaten the tithe.
Fane-ing Sympathy
The fanes are loose cartel-combines that control much of weapon production, theirs is an elective cross-class membership offering protection to their members. Metallicans may shift their allegiances between fanes or the lesser forges, but never do so lightly. Every fane boasts its temple of arms, with altars and reliquaries containing legendary weapons and archetype-models. They provide a modicum of stability, protecting their members, yet they too are regular players in the trade-wars that consume the city.
Examples:
The Fane of Doru: While possessing a great deal of money and resources, the fane of Doru garners little respect or influence among its peers. Regarded by the rest as "artless panel beaters and skulking cowards," Doru is seen as little more than a front for the Skaelen-Har Hegemony (one of the Great Houses), and they face an uphill struggle to consolidate or expand their power in the hive. They are continuously beset on all sides by backstabbing and petty indignities. In terms of arms, the Doru is largely limited to the mass-production of PDF patterns, generic spares and ammo.
The Forge of Fykos: Perhaps the most famous and wealthy of the Metallican independents, the Fykos dynasty has supplied the elite of the Calixis Sector with the most potent and exclusive of hunting weapons and arms for centuries. Many on Gunmetal regard them as dangerously arrogant and insufferably effete.
The Forge of Khayer-Addin: The family of Khayer-Addin are reputedly of fallen Rogue Trader stock and their family forge has provided master-gunsmiths for five generations. They specialise in one-off commissions, duelling pieces and a variety of artfully disguised guns and blades. To the Scintillan nobility, a Khayer-Addin weapon is a highly desirable item, often an exquisite and ornate work of art whose lethality is rarely exceeded.
The Fane of Orthlack: Allied to the ascendant power of House Hax of Sibellus, the Fane of Orthlack hold the ironclad contracts to arm the Scintillan Magistratum and the enforcer cadres of many other worlds. Old, powerful and influential, the Orthlack are among the most conservative of the great fanes and arguably the strongest.
The Fane of Takara: A rising power, the Takara are creators of superior las weapons of all types. They have strong Cult Mechanicus ties and recently fought off a takeover by the Fane of Doru, forcing a radical reassessment of their power and influence by others in the Metallican hierarchy.
The Fane of Westingkrup: A powerful and aggressive fane, and one with a long history of survival despite the odds, Westingkrup specialises in revolvers, hand cannon, shotguns and other "low tech/high-quality" arms with a just reputation for crafting robust, no-nonsense weapons. Westingkrup is also infamous for the number of regulators and gunslingers it routinely employs and its willingness to go to war over the slightest provocation.