cloudburst gear

Local Armaments
The Imperium is simply too large for universal standardization of weaponry and ammunition at the galactic scale.  Given the Cloudburst Sector’s relatively small origins, however, the Sector has seen significant standardization that would be unfeasible outside its borders.  Predictably, most of its common weapon designs are those of the worlds from which it drew its pilot populations, plus those Cognomen developed in their long isolation.
Here is a table describing most of the local arms, munitions, vehicles, and other military gear common to the forces of Cloudburst.  Note that the Space Marines of the Sector are not covered here, as their equipment is specified to the Martian and Solar templates, and does not deviate from them.

Handguns and Sub-Full Guns
Bluebird Sealed Revolver – [8x31mm] A common weapon to the officers’ corps of many regiments of the local Officio Munitorum.  This revolver started life as the sidearm of choice for the Cloudburst Sector’s Rough Riders.  Although it is heavy, the revolver caught on at once with its intended market, because of its unusual cylindrical ammunition storage system.  When the slugs are loaded into the cylinder, the cylinder springs forward to press flush with the bore of the weapon’s barrel, forming a perfect seal that prevents any gas from escaping the chamber when fired.  This means that the weapon can be silenced more fully than any other model of revolver in the standard arsenal of the local Imperial forces.  When paired with Cognomen-pattern muzzle-thread gas catch silencers, this means the Bluebird can be effectively sound-suppressed to the extent that the Rough Riders’ mounts will not be panicked from the sound of the shot.  That allows the Rough Riders to finish off downed opponents or stage stealthy attacks without having to worry about handling a skittish mount.
However, the weapon really took off with vehicle crews and artillery officers of the Sector Officio Munitorum regiments, far more so than Rough Riders.  These troops are rarely issued much in the way of hearing protection that can be used outside their vehicles, and the cramped interior of Imperial military vehicles means that they are rarely able to fit a proper long gun in with them.
The Bluebird has few accessory options beside their suppressors, but they do often ship with a tiny laser sight that can clip to the bottom of the barrel.  The weapon’s ammunition cylinder flips out to the user’s weak side, and loads seven bullets from a speedloader or manual load.
One benefit of revolvers over self-loading pistols – indeed, one of the very few – is that it can cycle by the user’s control instead of through the action of a discharging powder load.  Thus, the weapon can trivially load bullets with any powder pack, from barely enough to clear the slug from the barrel to a standard subsonic load, all the way up to overpressure loads that would break the pistol in half if it were not maintained.  That makes it very popular with troops in artillery regiments who are responsible for quietly approaching enemy positions to call down strikes, since a coupled subsonic round and excellent suppressor makes their shots all but silent.

Ocelot PDW – [9x20mm] Among the most popular and flexible weapons in Sector history is the Ocelot.  This weapon is designed to be fully modular, albeit under the control of a blessed gunsmith.  In the hands of a properly ordained armsmaster, the Ocelot can be expanded or shrunk to fit the user’s needs.  Its barrel, slide, grip, accessory rails, and magazines are interchangeable in size, allowing it to fit roles as far removed as a pistol-caliber carbine or a derringer.  By default, it is automatic, but can be purchased with a burst mode as well.
Originally, the Ocelot was designed on Cognomen as a sidearm for vehicle and aircraft crewers in the Officio Munitorum PDFs of Imperial worlds.  The worlds of the Cloudburst Sector have enormous variance in technology levels, and getting the PDFs of all those worlds to the same level of basic self-defense readiness is an even bigger pain in the fundament than the smaller Imperial Guard.  The Ocelot was created to serve as a weapon that could be dispatched to cavemen as easily as posh socialites or career soldiers.
The core of its flexibility is its fitting system.  With only a few simple tools, the slide and barrel can easily detach from the receiver, and be replaced with much smaller parts.  The grip can be shortened from a standard military pistol length to barely that of a pocket pistol or holdout weapon by similar methods.  Its standard fourteen-round magazine can be replaced with miniature magazines to fit the smaller grips, or even load stacked or drum mags with a hundred rounds.
To scale the weapon up, the barrel can easily mount suppressors, lengtheners, carbine-length barrel extenders, recoil compensators, and more.  To the back of the weapon, there is a slot on the weapon that allows it to plug its own holster in as a shoulder stock, and when paired with the lengthened barrel, allows the weapon to serve as a pistol-caliber carbine.
The most popular accessory for the weapon, however, is a folding wire stock that attaches on a pivot on the base of the grip above the magazine well.  The two wires extend back from the base of the grip with a clip between them to allow a suppressor to be stored in it, just behind the shoulder plate, allowing the grip to flip up one hundred eighty degrees over the weapon for storage.
The Ocelot can be suppressed easily thanks to its high-quality chamber and ejector design, which allow no gas to escape from the weapon except from the muzzle for just long enough for the slug to emerge from the barrel.  This makes it very popular with PDF on low-tech worlds that have not yet been entrusted with handling energy weapons, and must take care not to damage the hearing of its troops with unsuppressed firearms.

Mark VIIIa Laspistol – [Standard power pack] Before Cognomen received the very latest in Martian small arms designs to outfit its rapidly-expanding Sector with functional arms, it had to rely on its own to outfit the worlds of the Hapster Subsector.  The Mark VIIIa is one design that was not entirely phased out until long after the Cloudburst Sector itself was founded.  Nicknamed the ‘Villa’ thanks to its model number, this pistol saw millions of units produced to arm the Imperial Navy crewers and officers responsible for patrolling space near Cognomen and its precious route to Hapster.  Cognomen built these for thousands of years before getting better templates from Mars, but their degree of superiority was small enough that it was deemed not worth collecting and decommissioning all of the old ones to be replaced at once.  Thus, some Mark VIIIas saw military service for thousands of years after the Sector was founded, and hundreds of thousands have fallen into the hands of local authorities or criminals after leaving the Navy.

Long Guns
Razor Rifle “The Quarter to Two” (slug) – [.25x2inch] A relatively updated take on a Martian classic.  When the ancestors of Cognomen’s ruling class of Techpriests left the Sol System, they brought their legacy with them: hundreds of crates of old Martian hunting weapons to protect the colonists from whatever threats existed on the planet they would pick to settle.  These weapons were antiques, designed by the ancient Martian nobles and corporate overlords as hunting weapons for their safaris on the surface of terraformed Mars.  When the terraformation systems of Mars failed during the Age of Strife and again during the Horus Heresy and Martian Civil War, these weapons were left by the wayside in favor of more exotic weapons.
The time of the Razor Rifles came once more when the Cognomen settlers began the process of building their new home.  Although their world had little native life, they still needed to be able to protect themselves from it, and arm their soldiers to see of incursions.  Two weapons were designed initially: the slug and laser variants of the Razor, which was patterned after the ancient Martian template.
The slug variant uses a simple, cased slug of quarter inch thickness and two-inch unloaded case length.  This gave it its nickname among the troops.  The slug can be cased in any number of metals and alloys, and the slug can be made of flattening osmium to piercing steel, or even boring uranium, as the armorer needs.
This variant is very popular on worlds with PDFs that have not received laser weapons.  The big, hard-hitting bullet can reliably punch through soft armor and flesh, crack concrete, and fracture glass and plaster.  The standard rifle comes with a built-in selector with safe, single, burst, and full-auto settings.  Eventually, caseless telescoped variants of the slug were introduced, and some worlds use them, but there are trillions of bullets manufactured to the original spec, and many worlds did not adopt the caseless system thanks to its higher maintenance requirements.
The weapon is highly accurate, but it does have one drawback: length.  The rifle is long, with a barrel of well over two feet in length past the  receiver and well over four feet in total length thanks to its hefty stock.  In its roots as a hunting weapon, that was not a problem, but for military service, it can be clumsy and unhelpful.  After centuries of complaints from customers, Cognomen did produce a shorter-stock variant with much reluctance.

Razor Rifle (laser)
While this weapon may look like it is just a Cognomen Razor slug rifle adapted to fire laser blasts instead of bullets, there is more to it than that.  This weapon resembles its namesake, but only externally, and only for the convenience of troops outfitted with this version after being trained on the original.  The weapon is actually heavily modeled on the Mars-pattern Imperial Army Lasrifles of the early Great Crusade, after the Emperor decreed that they leave slug rifles for energy ones wherever possible.  Cognomen did not want to use the more exotic weapon payloads that were employed in some personal arms of Mars during the Age of Strife, since there would be no way to supply them in the remote Oldlight Proximate Circuit.  Instead, Cognomen based this rugged, accurate, and slightly heavy lasweapon after their Martian forebears’ household arms they used to equip their Taghmata during the Great Crusade.
This rifle is the most popular laser arm in the Sector by a factor of twelve.  Whole armies of Solstice, Coriolis, Drimmerzole, and Jodhclan are armed exclusively with this weapon and its long-las variant.  While all laser weapons are inherently as accurate as the shooter, this weapon’s length and practical sights make marksmanship fairly easy, even for poorly-trained PDF.

Shotguns
Hawkswood – [variable] This is technically a brand of shotgun, not a specific model.  While some of their competitors complain that Hawkswood got their exclusive military contract with the Sector military unfairly, no action has been taken on that complaint.
Hawkswood shotguns come in over fifty models, and four of them are standard for military issue.  The first is a simple pump-action weapon, with a tube magazine underneath the barrel.  This is identical to the one sold to many local Enforcer units on worlds where the Arbites are not the sole force of law.  It is useful for loading a variety of cartridges and powder loads, since a less-lethal cartridge may not work the action of a semi-automatic weapon by itself thanks to low powder load.  The other two are specialized tools for breaching hinges and doors.  The final is a breach-load, break-open target shooting gun that has been adapted to fire powerful flare cartridges.

Light Weapons
Razor Rifle – [.5x4inch] This rifle is a machine-gun variant of the same rifle technology that the more common infantry rifles of the same name use.  Firing a belt-fed fifty-caliber slug, this weapon is a crew-served or individual-operated light weapon in common use in the Cloudburst Sector militaries.  Many of these weapons wind up on the pintle mounts of military vehicles, or on the door mounts of light aircraft, but its primary use was and remains as an infantry team weapon.  Untold hundreds of millions of these Razors have been sold to armories across Cloudburst and beyond.

Heavy Weapons
Piercer – [20x127mm] An autocannon, usually used on vehicle-mounts.  The Piercer is not a template copy of the Martian standard patterns, but a local weapon designed to accommodate the same cartridge feeds used all over the Segmentum Ultima.  The Piercer is rugged, by design, and trades a bit of accuracy for reliability in wet environments.  While bulky, it is very easy to clean and maintain.  The many oceanic and swampy environments of the Cloudburst Sector demand such a weapon.

Melee Weapons
Harpes – The Harpes weapons were designed to be used by troops from the Drimmerzole Secundus Imperial Guard.  A scythe-like edged weapon, and a rarer Power variant, these weapons are difficult to learn to use and harder to master, but their unusual shape is something the users swear make them harder to predict.  The Officio Munitorum is not so sure about this, since Drimmerzole Secundus Guardsmen have a noticeable incidence rate of self-inflicted injury and dismemberment, but the weapons are powerful enough to remain on issue with Drimmerzole and Chlorit regiments.