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A note on "rate of fire" (ROF):
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ROF burst: use the Attack major action.
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ROF 1: use the Attack major action.
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ROF 1 or burst: use the Attack major action.
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ROF 2: use the Attack major action, and the Second Attack minor action.
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ROF 2 or burst: use either Attack major action and Second Attack minor action for two single shots, or just one Attack if firing a burst.
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ROF 1 per X rounds: use the Reload major action X-1 times, then the Attack major action.
Also, the various "burst" rates include the rate one step slower ... so a weapon capable of "long burst" can also fire "burst".
Small Arms
Atchisson Assault Shotgun

A magazine-fed open-bolt select-fire gas-operated shotgun, operating at 240 rounds per minute. The manufacturer in 1981 was Sceptre, Inc. of Marietta GA; the catalog name for this weapon was the Atchisson Assault 12. It can fire 2.75" or shorter 12 gauge shells; the barrel has a cylinder bore. The inline stock and long-recoil action allow the Atchisson to be controllable even when fired fully automatically. The clamshell stock is machined from two pieces of nylon. The weapon is 99.1 cm long, with a 46 cm (18") cylinder-bore barrel. Fitted with a sling, it can be fed from 7 round box magazines (which are not issued by the Morrow Project) or 20 round drums. The empty gun with sling weighs 4.7 kg; loaded drum magazines weigh 2.1 kg each. The normal issue in the Project is 3 loaded drums, for a total weight of 11 kg.
The designer also developed 32 and 40 round drums, but this was certainly not adopted by the Morrow Project (or at least not for any ground troops).
Note that there was also a semi-auto only version of the Atchisson Assault 12, which fired from a closed bolt; and in the real world (after 1989) a "close quarter battle" version with a barrel 5" shorter. Daewoo also built some of these guns in the mid-1980s, before designing the similar USAS-12 shotgun.
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Effective range 50 meters, ROF 1 or burst, malfunction 97+. The weapon skill used is either Rifle or Full Auto..
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The commonest malfunction is rounds jamming inside the drum. If using the 7 round box magazine, the malfunction number is 98+.
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background note: role kit #6 originally had a Remington Model 870 shotgun, until about 1983. With the Project's backing, Max Atchisson was able to get the weapon into a more finished state by about 1981. The Project's guns have no makers' markings or serial numbers.
Browning HP35

The usual pistol of the Project is the HP35, also known as the Browning Hi-Power. It is a single-action recoil-operated autoloading pistol, firing 9mm Parabellum ammunition from a 13 round magazine. The pistols employed by the Project were manufactured in the 1960s or later; most do not have tangent sights or the slot in the grip frame to accommodate the optional shoulder stock. However, they all have a slightly longer barrel (extending about 1 cm past the slide) threaded for suppressors, and fitted with a thread protector.
Holsters are Canadian military "Pattern 51", in olive drab canvas, and can store a spare loaded magazine. An olive drab canvas belt pouch is issued to hold two spare magazines. The empty weapon weighs 0.88 kg; loaded magazines weigh 0.205 kg each; the holster weighs 0.2 kg; and the magazine pouch weighs 0.1 kg, for a total issued weight (with 4 magazines) of 2.0 kg. The optional suppressor (not all kits include it) weighs 0.545 kg, plus a 0.1 kg belt pouch; note that the suppressor blocks the sights.
While the Project did not issue them, 20 and 30 round magazines were made by FN for these pistols. They won't fit in the Project's magazine pouches, of course. You'd be quite the gun aficionado to know about the larger magazines.
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Effective range 20 meters, ROF 2, malfunction 00 (effective range 10 meters, malfunction 99+ with suppressor fitted). The weapon skill used is Handgun.

pistol, holster, and two magazines

suppressor and pouch
Derringer

Many of the members of training platoons 40 through 55 "clubbed together" and bought double-barrel derringers in 9mm Parabellum caliber, made of stainless steel. Mass, 0.45 kg; a leather clip-on holster weighs 0.1 kg.
HAAM Gun
This is a ten round magazine for the HAAM Gun.
This is only a "small arm" by a whim of quartermaster's logic - it's 2.4 meters long. It is a magazine-fed, recoil-operated select-fire rifle, for use by the HAAM Suit. The 20x139mm ammunition is the same as used by the Rh202 autocannon, although it must be unlinked before loading into the magazines. Mechanically, the weapon is entirely different from the gas-operated Rh202, and the barrel and muzzle brake are about the only components in common. It is fitted with an integral modified PVS-4 Starlight Scope, which connects to (and is powered by) the HAAM Suit through the weapon's grip. There is a trigger on the gun, but normally the weapon is fired by the operator using a switch within the HAAM Suit's glove. The weapon weighs 80 kg empty; loaded 20 round drum magazines weigh 14.3 kg each. There are also 10-round magazines (7.9 kg loaded) and 50 round drums (34.3 kg loaded) available. Individual rounds weigh 0.31 to 0.44 kg (we're using an average of 0.4 kg).
High Standard M10B

A semi-automatic gas-operated "bullpup" 12 gauge shotgun. The receiver, barrel and tubular magazine are contained in a plastic stock; the buttstock can be rotated to fit against the inside of the shooter's elbow. It comes equipped with a sling, a folding carry handle, and a sturdy, detachable aluminum Kel-Lite or Mag-Lite flashlight, which (when attached) shines ahead of the gun. Rounds are ejected (rather violently) from the right side of the gun; and in fact the stock has the words "CAUTION - DO NOT SHOOT FROM LEFT SHOULDER" molded into the right side. Also molded into the stock is a warning to use only magnum or high-brass shells.
The weapon holds four rounds in the magazine, plus another in the chamber. The 0.5 kg flashlight uses two Project MI-AA batteries, in plastic "D-cell shaped" adapters. The Project would not issue this weapon to left-handed persons. Weight empty with flashlight, 4.4 kg; loaded, 4.8 kg; as issued with 50 rounds 00 buckshot, 8.4 kg. This weapon went out of production in 1977; the Project bought up nearly a thousand of them just before then.
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Effective range 50 meters, ROF 1, malfunction 96+ (91+ with non-magnum shells). The weapon skill used is Rifle.
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The commonest malfunction is a failure of the action to chamber a new round. The flashlight bulbs get broken by recoil pretty often. For left-handed users, the commonest fumble is trying to fire the gun from the shoulder.
HK69A1

A single-shot 40mm grenade launcher. Any of the low-pressure 40mm grenades may be fired from the HK69A1. A folding sight is fitted, along with a sling. Unloaded mass is 1.8 kg. An adapter to allow the use of 12 gauge ammunition in 40mm launchers is issued with the HK69A1; it weighs 0.3 kg. The adapter is about the size and shape of a regular 40mm round, so its "barrel length" is only about 7 cm.
Ingram M10

A small recoil-operated open-bolt submachinegun, in 9mm Parabellum; it can operate in semi-automatic mode (single shot) or on full auto (with a 1090 rounds per minute rate of fire). It comes equipped with a folding stock, and a short fabric "grip strap" (to be used by the shooter's off hand). It feeds from 32 round magazines (loaded mass 0.62 kg each). The muzzle is threaded for a suppressor (0.54 kg), which is wrapped in a neoprene sheath. The empty weapon weighs 2.81 kg; the weapon with suppressor and 12 loaded magazines weighs 10.7 kg. The usual shoulder holster and magazine pouch rig (seen above) holds the loaded weapon and four spare magazines; it can be unbuckled and reconfigured for left-handed shooters.
While not issued to individual users, spare suppressor "wipes" are stored in some bases.
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Effective range 15 meters (but only 8 meters when fired full-auto, and only 5 meters one-handed on full auto), ROF 2 or long burst, malfunction 98+. The weapon skills used are Handgun or Full Auto.
Low Maintenance Rifle

While not issued to Project teams, this gas-operated automatic rifle is found in caches and depots, and is intended for distribution to security forces. It fires 5.56mm ammunition from the same 30 round magazines as the Stoner system (unlike the LMRs built for the US Government, which use normal M16 magazines); the magazines are inserted into the left side of the weapon. The weapon fires in (slow) full-automatic mode only; here is no single-shot setting. The materials and design of the LMR (made by TRW) emphasized durability and resistance to corrosion. Empty weight is 3.3 kg; loaded 30 round magazines weigh .54 kg. A scan of the manual can be found here. Note that Project LMRs can use the M6 or KCB-70 bayonets, and the M2 bipod.
MAG-58

this image is not entirely correct -- Project MAG-58 guns have wooden buttstocks and British-style (smooth-sided) flash hiders
Also known as the FN MAG, or the M240 by the US Army. This is a gas-operated select-fire belt-fed machinegun, firing 7.62x51mm NATO ammunition. It is very strongly built, using the same locking system as the BAR, and a quick-change barrel. Before 1989, the only notable use of these weapons in the American military was as coaxial machineguns on some armored vehicles. It can be fired from the shoulder, its integral bipod, various tripods (the type used by the Morrow Project weigh 15.9 kg), or pintle mounts on vehicles.
Unloaded, it weighs 10.85 kg, including bipod and sling. A 100 round belt of ammunition weighs 2.94 kg. When supplied as a vehicle weapon, there will be a spade grip and trigger activator supplied as alternate equipment. It can mount telescopic sights and night-vision equipment (with the correct adapters). An accessory took kit (1.0 kg) comes in a canvas roll, with cleaning equipment and minor tools for assembly and adjustment.
Individual or vehicle weapons usually are issued with one or more spare barrels, and a canvas barrel carrier. Barrels supplied with a particular weapon can be swapped freely, but barrels must be headspaced to a particular weapon. Adjusting headspace is a task for an armorer: "Unless direct-support personnel certify the headspace on both weapons, avoid swapping barrels between weapons, because doing so could cause you to suffer injury or death."
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Effective range 100 meters, ROF burst, malfunction 00. The weapon skills used are Rifle or Full Auto. If the shooter has a skill of 60% or more, they can fire as ROF 1.
Marlin 1894

A lever-action carbine, in .44 Magnum caliber. The tubular magazine can hold 10 rounds.
The weapon can chamber and fire .44 Special ammunition also (and will hold 11 rounds in the magazine). The malfunction rate is 96+ with .44 Special ammo.
Mass 3 kg.
M203
Stoner M22 Rifle with M203 Grenade Launcher
A single-shot 40mm grenade launcher, which must be mounted on other weapons. In the US military, they are fitted to M16 rifles; in the Project, they are attached to either the Stoner M22 rifle or M23 carbine. Any of the low-pressure 40mm grenades may be fired from the M203; however, a few of the longest grenades (parachute flares and less-lethal rounds, mostly) have to be awkwardly loaded by dismounting the launcher's barrel. The usual fore-end of the M22 rifle or M23 carbine is replaced with a special M203 fore-end; a tall, folding ladder sight is added to the normal rifle/carbine rear sight. The US military quadrant sight cannot be fitted. The launcher itself, unloaded, weighs 1.4 kg. An adapter to allow the use of 12 gauge ammunition in 40mm launchers is issued with the M203; it weighs 0.3 kg. The adapter is about the size and shape of a regular 40mm round, so its "barrel length" is only about 7 cm.
M14
Many Project teams are issued an accurized M14 as a team weapon -- especially for use with a night vision scope. These are very similar to the M21, but aren't adapted to use the two-point mounting base for the ART-II telescopic sight.
Various accessories -- notably the blank adapter, M2 bipod (0.8 kg), M76 grenade launcher, and M6 bayonet -- were made by the U.S military for the M14, and will fit on this weapon, but are not usually issued by the Project. The KCB-70 bayonet will NOT fit on the M14 rifle. The weapon unloaded weighs 4.3 kg (including a 0.2 kg leather sling); empty 20 round magazines weight 0.24 kg, loaded 20-round magazines weigh 0.68 kg.
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Effective range 140 meters with M118 match ammunition (120 meters with regular ball ammunition), ROF 1, malfunction 00. The weapon skill used is Rifle.
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Most common malfunctions are ammunition related: bad primers, separated case heads, total misfires. Commonest fumble is magazine not inserted correctly, followed by setting the sights to an incorrect range.
M21

A semi-automatic gas-operated sniper rifle in 7.62mm NATO caliber. It is an accurized version of the M14 rifle, equipped the National Match rear sight, and issued with a scope mount, Leatherwood ART-II 3x-9x telescopic sight with rings (weight with mount about 0.7 kg), green fiberglass case for carrying the sight, adjustable leather sling, a Sionics SS-1 noise suppressor (weight 0.88 kg), and an olive drab canvas pouch to carry the suppressor.
To attach the suppressor, the operator must remove the normal flash hider and front sight from the barrel; thus the suppressor can only be used accurately with a telescopic or night-vision device.
The AN/PVS-4 night vision scope can be mounted on the weapon, but is not automatically issued with the kit. Note that when attaching a scope to this weapon, the user needs to have some skill and time at a range to re-zero the scope. The weapon can fire regular 7.62mm ammunition, but is usually issued with M118 match-grade ammunition. The suppressor will last about as long as the rifle -- with one exception: prolonged rapid fire will overheat and destroy the suppressor.
Other accessories -- notably the blank adapter, M2 bipod (0.8 kg), M76 grenade launcher, and M6 bayonet -- were made for the M14, and will fit on this weapon, but are not usually issued by the Project. The KCB-70 bayonet will NOT fit on the M14 or M21 rifle. The weapon with all accessories but no ammunition weighs 5.3 kg; empty 20 round magazines weight 0.24 kg, loaded 20-round magazines weigh 0.68 kg. The weapon, set up with the Leatherwood scope, scope mount, sling, and a fully loaded magazine, but no suppressor weighs 5.425 kg.
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The ART-II telescopic sight is not calibrated for use with subsonic ammunition (which the Project does not issue in any case). Production ended in 1984. Note that the Project's ART-II uses a "two point" mounting: it attaches to the usual mounting point on the receiver, and a part which replaces the stripper clip guide. To use the scope with an M14 rifle, a "single point" mounting is used.
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Effective range 180 meters with M118 match ammunition (150 meters with regular ball ammunition, or with the suppressor fitted), ROF 1, malfunction 00 (malfunction 99+ with suppressor fitted). The weapon skill used is Rifle.
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Most common malfunctions are ammunition related: bad primers, separated case heads, total misfires. Commonest fumble is magazine not inserted correctly, followed by setting the sights to an incorrect range.
Remington Model 870 Police Magnum

A pump shotgun, chambered for 12 gauge 3" Magnum rounds (though any shorter or less powerful 12 gauge shells can be used). The tubular magazine holds six shells; another can be carried in the chamber, ready to fire. Parkerized finish, hardwood stocks, 18.5" (47 cm) improved-cylinder-bore barrel, sling swivels, rubber recoil pad, bead sights. Weight empty, 3.5 kg.
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Effective range 50 meters, ROF 1, malfunction 99+. The weapon skill used is Rifle.
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The commonest fumble or malfunction is to cause a jam by short-stroking the action; this is fairly easy to clear if you know the gun and have a bit of time. This problem wasn't cured till about 1987 when Remington introduced the flexitab carrier.
Smith & Wesson Model 27
A medium-size .357 Magnum six-shot revolver; it can also chamber and fire .38 Special ammunition. The Project issues them with 3.5" (8.9 cm) barrels. Empty weight 1.24 kg.
Smith & Wesson Model 29
A large .44 Magnum six-shot revolver; it can also chamber and fire .44 Special ammunition. The Project issues them with 6.25" (15.9 cm) barrels. Empty weight 1.35 kg.
Stoner Weapon System
The Stoner system uses a core set of parts to build several gas-operated 5.56mm NATO firearms. The weapon can be set up with various barrel lengths; belt or magazine feed (and top or bottom mounted magazines); fixed, folding, or no buttstock. Sights, forestock, bipod (only for machine-gun versions, mass 0.4 kg, and sometimes found with a 0.1 kg belt carrying pouch) and other minor components can also be varied.
The Project didn't equip its teams with the top-loading magazine "automatic rifle", which needed a specific barrel and set of sights.
Loaded 30 round steel magazines weigh 0.54 kg (only 0.44 kg for loaded aluminum magazines); 100 round belts of 5.56mm linked ammunition weigh 1.3 kg, and are normally issued in 0.2 kg plastic tubs; these tubs fit in the normal ammunition pouch worn on the belt. Note that Stoner magazines resemble, but are not interchangeable with, AR15/M16 or Mini-14 magazines.

The Morrow Project doesn't often issue 20 round magazines -- mostly those are for "survival" carbines. Note that all these magazines (and US GI magazines for AR15/M16 weapons before 1988) don't have anti-tilt followers.
For the machine guns, spare barrels are available (2.7 kg). Machinegun versions fire full-auto only, from an open bolt. The tripod adapter (0.9 kg) allows the weapon to be mounted on NATO-style tripods or vehicle pintles.
A special forestock allows the M203 grenade launcher (see below) to be mounted on the Stoner rifle or carbine -- the M203 cannot be fitted to the Mk23 or the M207, as the charging handle is on the underside of the forestock for those versions. Over the years, various minor variations exist in stocks, barrels, magazine construction, etc. Weight includes (except for the coaxial version) sling, cleaning kit (stored in the pistol grip) and winter trigger adapter. American military M7 or M9 bayonets can be fitted to the M22, M23 and M207, but the Project normally issues the KCB-70 bayonet instead. Telescopic sights and night-vision scopes can be fitted to the rifles or regular carbines -- but not the belt-fed guns, or the survival carbines -- with a special proprietary base which entirely replaces the rear sights.
every Stoner weapon (except the survival carbine) uses these components
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Stoner M22 rifle: rifle barrel, fixed stock; empty 3.7 kg, loaded 4.24 kg. Effective range 80 meters, ROF 1 or burst, malfunction 97+. The weapon skills used are Rifle or Full Auto.
Stoner rifle
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Stoner M23 carbine: carbine barrel, side-folding stock; empty 3.7 kg, loaded 4.24 kg. Effective range 60 meters, ROF 1 or burst, malfunction 97+. The weapon skills used are Rifle or Full Auto.
Stoner carbine
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Stoner survival carbine: side-folding stock, special barrel; empty 3 kg, loaded 3.5 kg. This version has a shortened grip, modified fore-end, modified barrel (38 cm long) and gas system, different rear sight, and a modified operating rod. The barrel is welded to the gas tube, so this weapon isn't really interchangeable with the rest of the Stoner system. It does have the quick-change feature, to allow the disassembled weapon to be brought quickly into action. It's usually issued with one 20 round magazine, and a supply of loose ammunition. Effective range 50 meters, ROF 1 or burst, malfunction 96+. The weapon skills used are Rifle or Full Auto.

Stoner survival carbine
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Stoner Mk23 commando light machinegun: fixed stock, belt-fed, full automatic only, short MG barrel, empty 4.5 kg, loaded 6.45 kg. Effective range 60 meters, ROF burst, malfunction 96+. Commonest malfunction is failure of action to cycle entirely after firing a round with nearly-full linked belt (not enough energy to pull up the linked ammunition). The weapon skill used is Full Auto.
Stoner commando machinegun
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Stoner M207 light machinegun: belt-fed, regular MG barrel, fixed buttstock, full automatic only, bipod, empty 5.4 kg, loaded 7.35 kg. Effective range 70 meters, ROF burst, malfunction 97+. The weapon skill used is Full Auto.
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Stoner coaxial machinegun: belt-fed, regular MG barrel, no stock or grip, full automatic only, solenoid trigger, empty 4.62 kg. Effective range 70 meters, ROF burst, malfunction 97+. The weapon skills used are Direct Fire Weapon or Full Auto.
Ammunition
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7.62mm NATO: the Project issues ball (M80), tracer (M62), and match-grade (M118) ammunition. For use in machine guns, the ammunition is issued in M13 metallic links, as a mix of 4 ball to 1 tracer round. This ammunition is widely used by the US military for belt-fed machine guns.
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Linked ammunition for "dismounted" use is issued in steel "30 cal" ammunition cans, with 200 rounds per can; each 100 round belt is packed in a cloth bandolier with a shoulder strap. Four of the cans are packed into a wooden case with 800 cartridges total, weight 34.92 kg, volume 14 liters.
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For vehicular or emplaced use, linked ammunition is provided as a single belt of 200 rounds in a steel "30 cal" steel can.
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Ball, tracer or match ammunition is issued in steel "50 cal" ammunition cans, each can holds 460 cartridges (23 paper cartons of 20 cartridges each). A wooden case with two cans holds 920 cartridges, weight 31.29 kg, volume 14 liters.
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Penetration 4mm RHA steel (12 pts armor; damage 2d6+4).
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7.62mm NATO AP rounds (M61) can penetrate 7 mm of RHA steel (14 pts armor), but are not standard Project issue.
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5.56mm NATO: either ball (M193) or tracer (M196). The standard rifle ammunition of the US military from the late 1960s to the early 1980s.
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For use in Stoner machine guns, the ammunition is issued in 100 round Stoner-system linked belts, as a mix of 4 ball to 1 tracer; six of these tubs (600 rounds) are packed in an .50 cal steel ammo box.
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Ammunition for rifles and carbines is issued on 10-round stripper clips, in cloth bandoliers; a .50 cal ammo box (~7 liters) will hold 820 rounds on stripper clips. The normal issue for non-linked ammo is two steel ammo boxes in a wooden case of 1640 rounds, weight 31.3 kg, volume 14 liters.
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Penetration 3mm RHA steel (10 pts armor; damage 2d8).
the usual wooden case for 5.56mm rifle ammunition
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9mm Parabellum, aka 9x19mm: all Project issued 9mm ammo is full-metal jacketed (M882). A .50 cal box (7 liters) will hold 1000 rounds of 9mm ammunition. The Project more often issues 9x19mm ammo in wooden crates of 2880 rounds, with a case weight of 52.16 kg. Penetration 1mm RHA steel (7 pts armor; damage 1d10).
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.357 Magnum: the Project issues name-brand cartridges, somewhat arbitrarily with lead or jacketed bullets. The usual Project issue is 2500 rounds in a metal-lined wooden case, case weight 41.73 kg, case volume 14 liters. Penetration 2mm RHA steel (9 pts armor, damage 1d10+2).
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.44 Magnum: again, name-brand cartridges, usually lead or jacketed bullets. The usual Project issue is 1200 rounds in a wooden case, case weight 43.1 kg, case volume 14 liters. Penetration 3mm RHA steel (10 pts armor; damage 2d6+2).
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12 gauge: all are military-issue, some are all-brass, some high-base with plastic hulls. 2-3/4" Magnum 000 buckshot. Penetration 0.8mm RHA steel (6 pts armor; damage 4d6/2d6/1d6, counted separately against armor). If encountered, 12 gauge full-bore slugs will penetrate 2.5mm to 5mm of RHA steel (10 to 13 pts armor; damage 4d6+1).
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.22 Long Rifle: brand-name cartridges, with lead bullets. Penetration 1mm RHA steel (7 pts armor; damage 1d6) at most.
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.410 gauge: birdshot (well, #6 shot), signal flare, slug, buckshot. Birdshot has minimal penetration (armor value 1; damage is 1d6+1/1d3/1d2, counted separately against armor); slug penetration about 1mm RHA steel (7 pts armor; damage is 1d10+2).
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.50 caliber: military-issue, in belts of either 100 or 105 rounds; a .50 cal box will hold one belt. Project ammunition is a mix of four M8 API rounds to one M20 API-T round. A 105 round belt weighs 13.05 kg; the usual M2A1 steel can weighs 2.3 kg, so a can+105 rounds weighs 15.35 kg, with a volume of about 7 liters. M8 API will penetrate 17.6mm of RHA steel (armor value 21; damage 4d6+1) at 100 meters.
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40mm grenades
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20x139mm
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81mm
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