Don't forget that it is a shotgun or a great weapon or two low tech melee weapons.

Additional Equipment
 Crafting Workshop - Solid Projectile Firearms & Ammunition
 Crafting Workshop - Laser Firearms
 Crafting Workshop - Electronics

I'm just saying that the workshop labs work with existing gear...not making new gear for us.

Mantraps, exterminator cartridges, chain-knife attachments, forearm mounting kits and recoil gloves are in the vein of requisitioning more gear

Keep in mind the categories you have available at the outset of the game. So...no armor mods yet. Probably after success on the first mission. Can't make things too easy for you! ;)

So a small bonus to a single type of SP weapon or ammo that might also include grenades?

Ex...Regiment favored heavy weapon Autocannons or kit Combat Shotguns get a +1 damage

Frag or a Krak grenade increasing the Concussive quality by +1

Crafting Workshop

The Disciples of Thule are, like any Mechanicus group that follows the preachings and guidance of the Omnissiah, inveterate tinkerers. Theirs is a constant and unwavering dedication to preserving, repairing, modifying, and upgrading every bit of technology they come in contact with...all for the betterment of mankind and the furtherance of their understanding of the world of Machine Spirits.

To this end, they have placed a dedicated laboratory-workshop at the disposal of their units whenever they are engaged with enemy forces. This scientific arm of the organization is always located orbiting in space, safely away from the battlefield, tucked away within the safety of the rest of the fleet. Other than the actual minutions and supplies needed to sustain the fighting forces, it is given one of the highest priorities for allocation of resources during a campaign - for how else can they hope to continue their overarching mission if they do not continually evolve and grow themselves?

The game mechanics of this workshop are simple: before each mission begins, during the selection process, the players will discuss and choose two items that they currently have in their possession, and for which they currently have lab/shop facilities. These items can have any one aspect of their functions improved by +1 or 10%, as appropriate.
   - Thus, a weapon might gain +1 to its damage output [since most use a base of d10].
   - Another weapon might gain +10% to its range increment.
   - A piece of equipment might increase its duration of effect by +10%
   - Another piece of equipment might improve a skill bonus by an additional +10%

Obviously, some things won't fall easily into the +1/10% category. You can't add +0.3 armor to a location, or give yourself a 10% bonus to determine your exact location with a Locator Matrix. Well, you *can*, but it would be rather silly. Therefore, in all cases where the math does not easily fall into line with the game mechanics, the GM will be the final arbiter of what benefits are gained for a particular item or weapon. These will be determined before the unit makes their final request, so there will be no surprises.
   - An outstanding success on a mission *may* result in a slightly greater modification, or a secondary, unrequested effect being added to the item in question.

Note that these upgrades will only be released to the unit upon successful completion of the current mission. If the unit made two requests and then does not meet the mission requirements, the upgrades are delayed or withheld until the follow-up mission is completed successfully, and no new items may be sent to the workshop until the first two are completed and released.

Yeah.

My top two would be adding +1 to the Blast for Frags and +1 to Concussive for Kraks.  We all have grenades regardless of if we have grenade launchers.  The frags will increase the kill zone and the kraks will mean that anyone hit by one will have to take a Toughness test at a -10 or be stunned for 1 round per degree of failure.  That could be gold on larger Tyranids.