The Edge Of Darkness Additum

Prolonged Barrel.
Usually more of an unauthorized field modification (often made by snipers and those who just want a bigger gun) than a conventional upgrade, prolonged barrels offer a slight increase in a weapon's range at the cost of comfort. Made of everything from utility metal tubes to high-end hardwired plexi-steel with embedded fire-accelerator, they vary in design and craftsmanship but, mostly, produce the same effect.
Effect: Increase the range of a weapon by one-third (round-up). The firer receives only +10 bonus on his Ballistic Skill when firing the weapon at point-blank range. The firer receives -10 penalty to his Ballistic Skill when firing such a weapon one-handed, unless it's a pistol (not a hand-cannon though). The firer also can't use such a weapon to shoot at an opponent who has Engaged with him at melee.
Weapons: Any Pistol or Basic SP, Bolt or Primitive (ranged, firearm) weapon that do not possess the Scatter quality.
Special: Can’t be combined with silencer.
Craftsmanship:
Poor: Weapon also gains Unreliable and Overheats special qualities.
Good: No penalty for firing one-handed.
Best: As Good, but with embedded fire-accelerator (see below). Adjust the price accordingly and then multiply for Best craftsmanship.

Fire Accelerator.
Highly sophisticated and capricious device, this upgrade enhances the damage out-put by guiding the weapons own ballistic gases in back into firing system or generating a magnetic field along the barrel. Weapons so upgraded, while suffering a reduce in re-firing capacity, greatly compliment its owner’s lust for smoking holes, loud noises and heads, exploding in clouds of blood-stained bone pieces.
Effect: Increase weapon damage by 3. Reduce semi- and full-automatic rates by 2. If weapon’s semi- or full-automatic rate becomes 1 or less, it can no longer be fired in a given mode. Also, the weapon gains Recharge special quality if fired on full-automatic.
Weapons: Any SP.
Special: Can’t be combined with silencer.


Gyro-stabilizer.
Arcane and unbelievably rare mechanism, highly prized by those, who want to get the best out of their gun (and they are legion), it’s principles known only by Master-Weaponsmiths of Adeptus Mechanicus, the gyro-stabilizer is capable of reducing or even negating recoil of almost any weapon.
Effect:
1.If installed on Pistol or Basic weapon, the weapon in question gains Accurate and Tearing special qualities.
2.If installed on Heavy weapon, the weapon in question can be fired on semi- or full-automatic with no bracing required(but do not gain any other special qualities).
Special:
1.This upgrade can be installed only on weapon which is already of Good Craftsmanship. Increase the weapon Craftsmanship to Best with all relevant mechanics applies.
2.This upgrade can’t be installed on a weapon on which Gun-Shield is installed already and vice versa.
Weapons: Any Pistol, Basic or Heavy SP or Bolt(although this would be a disrespect to the weapon and a sign of weakness).
 
Cooling System.
Imperium-widely fielded by anti-tank squads and guerrilla warbands alike, these systems slow hull and integral mechanisms heating, which leads to more stable and reliable use of plasma and some las weapons.
Effect: This upgrade suppresses Overheats and Recharge special qualities for 2d5 shots, after which it becomes inactive cooling itself for (dice roll result)*2 shots.
Craftsmanship:
Good: If upgraded weapon is Unstable, this upgrade causes it inflict normal damage(no roll needed) for the same amount of shots.
Best: As Good, but the weapon is still capable of inflicting increased damage on appropriate dice roll result.
Weapon: Any Plasma or Las weapon which Overheats or need to Recharge.

Feather-blade.
Exceptionally lightened and thinned to almost duo-dimensional form, feather-bladed weapons field of employment is stealthy, delicate and mostly unpleasant business (like civilian massacre as some would suggest looking on smooth, accurate wounds such weapon inflicted).
Effect: The weapon looses Primitive special quality. The weapon gains Fast and Balanced special qualities. Increase the weapon damage done to unarmored targets and critical damage by 2. Weapon Pen becomes 0. The weapon still counts as Primitive against armor with Armor Rating of 3 or more(even if the armor itself is Primitive).
Special: If the weapon to which this upgrade is applied was of at least Good Craftsmanship – do not change its Pen.
Weapon: Any Melee(but not Chain or Power)


Gun-Shield.
Taking the form of long overhand metal ramp, or side-mounted buckler, the Gun-Shield is a common name of a melee-attachment for those who prize defense over offense.
Effect: Weapon counts as a melee weapon with Defending special quality(and, with application of an appropriate penalty can be used in melee as an improvised weapon). Firing a weapon with Gun-Shield attached one-handed imposes -20 penalty on user’s Ballistic Skill(which is not offset by Recoil Gloves or similar equipment or Talents).
Craftsmanship:
Poor: Weapon gains Inaccurate special quality.
Good/Best: Instead of Defending, weapon gains Balanced special quality and do not impose -20 penalty on Ballistic Skill when fired one-handed. Also, the Gun-Shields of Best Craftsmanship can not be destroyed by the effects of a power-field and counts as having Armor of 15 if directly attacked. .
Special: While wielding two Pistols with Gun-Shields in each hand, add 1 Armor point(Primitive if Gun-Shield is of Poor or Common Craftsmanship, Normal – if Good or Best) to Arms location.
Weapons: any Pistol or Basic weapon can have a Gun-Shield.