Stormtrooper Carapace has no description in the text. From pg. 143 in Dark Heresy Ascension on Cadian-Pattern "Kasrkin" Storm Trooper Carapace :

"The Departmento Munitorum in the Calixis Sector has long adopted the Cadian pattern carapace armor for its Storm Trooper units, feeling that a design used by one of the Imperium's most vital fortress worlds has an implicit recommendation. Storm Troopers are elite and versatile troopers, and their armor must be equally versatile.

"Kasrkin" carapace is designed to be worn as a complete suit. It has an integral auspex unit with wrist display and attachments for a grav chute. The carapace helmet is equipped with a rebreather, photo-visor, encrypted micro-bead, and a clip attachment on the side of the helmet for either a lamp pack or a vid-recorder. These systems are powered by a small charge pack (equivalent in cost and size to a lasgun charge pack) that must be replaced after a week of continuous use."

The Primitive quality of page 123: "Crude and basic in design, these kinds of weapons, while still deadly, are less effective against modern armour. When
rolling for Damage with these weapons, any dice roll greater than the number in parentheses (X) counts as that number."

This fluff implies that the rules text should be "When rolling for Damage with these weapons against a target wearing armour that is not primitive, any dice roll greater than the number in parentheses (X) counts as that number."

Otherwise you have hide armour being just as effective as stormtrooper carapace, or primitive weapons being less effective againt armour of rambo.

According to weekly updates the Shotgun (Pump-Action) has had its damage reduced to 1d10+3 and its clip increased to 12; yet both the regular Shotgun and Combat Shotgun have not been addressed for reduced damage, and the Shotgun; presumably intended to represent double-barreled varieties, still retains its clip of 8.

The damage for shotguns does not need to be adjusted; 1d10+4 has been typical of generic models since Dark Heresy was first launched.  However, the so-called "clip" sizes do need some attention.  Suggestions follow:

• Shotgun (double-barrel?) - Clip Size: 2
• Shotgun (pump-action) - Clip Size: 12 is feasible; such a design would likely utilize a side-by-side tubular magazine.
• Combat Shotgun - Clip Size: 18; fine as it is.

Just some thoughts.

-=Brother Praetus=-

 Smoke weapons should have a value assigned to them, the Smoke Grenade and Round do not.

 I'm also missing the indirect and barrage fire rules for vehicles, they are mentioned in the text and on the chart on page 186 but nowhere else…

p. 125 (and p. 155ff)

Just a minor detail, but the heavy stubber has a clip of 75. With a ROF of -/-/8 that's silly.  72 or 80 (preferbly) would make sense, 75 does not.

Musclewizard said:

then either delete the "basic weapon" from the upgradable weapons or explain what bracing does if done with a basic weapon.

p.151 Vechicle Types: when you say that there will be no rules for aircraft/spacecraft why waste book space mentioning it?

Page 114

First Paragraph

Last Sentence

Last Word

misssions should be missions

Page 124

Unwieldy

Finese should be Finesse

Page 126

Table 6-9

Hunter-Killer Missile special entry needs a dash like the other blank entries

Page 128

Plasma Pistols

Needs a full stop at end of paragraph.

Page 130

Hallucinogen

explosivess should be explosives

Page 130

Table 6-10

Smoke Grenades need double daggers in the special slot

There is nothing in the Starflare round special slot

The triple dagger note does not reference anything in the table

Not sure if it belongs here or in mechanics discussions, but eh.

 Red Dot Sight should have an explanation of what it is. If it's red dot reflex sight, it's a sight and should provide a bonus of a quick target acquisition (as you don't need to align sights, you just place the dot over the enemy, whenever your eye is, as reflex sight has little parallax), not a BS bonus which is usually associated with magnification (ACOG sights do that for assault rifles, telescopic sights for sniper rifles) or targeting aids (movement prediction, range finding & bullet drop compensation, wind compensation etc.). If it's a laser sight, it's a targeting device that shouldn't take the place of an actual sight on top of the weapon, it should have an option to emit a preysense-visible beam instead of a visible dot and should provide bonuses to shooting without aiming (as you can aim by the dot instead). Mechanically, it could do anything from granting Hip Shooting-like benefit to increasing Initiative.

The sniper rifle lists a bipod as a provided upgrade, but it doesn't have any effect. IMHO, sniper weapons should be their own subclass, as they posess unique capabilities of finding weak spots in armour and anatomy (currently represented by a specific paragraph in the Accurate quality; it has its loopholes, though, for example a Cadence Widower device from Dark Heresy, when fully assembled, suddenly becomes a lot deadlier than its pistol version), but they also require a steady fire base (bracing and/or bipods) for long-range shooting and increased maintenance (frequent barrel replacements, for example, for both long-las and SP rifle).

Needle weapons, while described as silent, lack any associated mechanical bonuses, but are able to mount suppressors. Why? They should be nigh-impossible to hear instead (-40 to Awareness test to hear it and only from quarter the usual distance, for example).

There should be an option for suppressing las weapons in Only War, something like Whisper-Bolt from RT:HA. That would be very useful for an airdropped special operations squad which has to operate for a long time behind enemy lines (so suppressed autoguns are a bad logistical option), for example a covertly dropped Elysian Veteran squad.

Chameleoline Doctrine lists chameleoline-coated armour as possible equipment, but it's not present within the book.

Amputator Shells are +2 to Damage and Extremely Rare, Expander Rounds are +1 to Damage and Penetration (so cause equal damage against armored foes) and are Scarce. Aren't Amputators a bit overrated?..

Manstopper Bulltets increase Penetration by 3, is that a typo? It sets Pen to 3 in earlier books… but it's more logical this way anyway (a Sniper Rifle loaded with AP .357 rounds will indeed have a Pen of 6 and would penetrate light tanks and power armour).

Locator Matrix does provide a volume of data but it doesn't have any mechanical bonus. It should have +10 or +20 to Navigation (Surface) or something.

I think the +10 to BS bonus from Good Quality MIU should be transferred to MIU Weapon Interface, so it could either be used to enhance precision of a specifically-modified weapon (+10 to BS tests, requires some kind of a sight and installed temperature/ammo sensors, allows to aim a weapon without looking, fire from around corners etc.) or to fire a shoulder-mount as a Free Action. It's almost too good this way, though…

Page 132
Eviscerator
obcenely should be obscenely

Table 6-12: Melee Weapons
Knife is missing a dash in the special column

All Melee Weapon Entries
This a one-handed melee weapon.
Should be
This is a one-handed melee weapon.
And
This a two-handed melee weapon.
Should be
This is a two-handed melee weapon.

Page 139
Hot-Shot Charge Pack
Is it lascarbine or las carbine (consistency error)
In the weapon’s entry it is las carbine.

Page 141
Table 6-19 Force Fields
Third column should have kg in brackets. Or to stay consistent with the other tables each weight entry should include kg and it should be removed from the header.

Page 142
chameleoline cloak
In the first sentence there should be a full stop after surroundings.

Page 142
Clip/Drop Harness
harnasses should be harnesses

Page 143
Excessive Drug Use and Addiction
Last sentence in the first paragraph needs a full stop.

Page 146
Mantrap
…and rendering him0 Immobilized. Should be …and rendering him Immobilized.

Page 147
Cybernetics
For the effects of craftsmanship on cybernetics, some are bulleted and others are not.

Page 149
Luminen Capacitors
Channeled should be Channelled

Page 150
Memorance Implant
consistes should be consists

Page 155
Imperial Guard Vehicles
Inconsistency in brackets; in the Demolishers Multi-Melta should the entry Blast (1) be Blast [1]