Le Vet Boltgun
 Veteran Build - Warhammer 40k: Darktide 

Weapons, perks and blessings

Mk VI Combat Blade is really amazing for taking care of any units that the boltgun would just not benefit from, ammo wise. At the bottom of the talents section, in the Reciprocity and Desperado part, I go over the choices a bit more in depth. Simply put here, Unyielding is most bosses armor type. And Crit Chance from both the perk, and Riposte will pair wonderfully with Flesh Tearer.

Locke Mk IIb Spearhead Boltgun is great for killing anything thats an elite, special, or boss even. (though I don't recommend doing so, unless you really struggle melee'ing bosses. Your ammo will thank me later.)

Carapace armor for everything such as Crushers, or Mauler heads is pretty nice, considering if you see many of those, its pretty much a free call for you to pull out that boltgun and get blasting. Unyielding goes for the same reasons as knife, besides the fact that bulwarks also are Unyielding type, which is a nice bonus for boltgun.

Shattering Impact will be great to back both you and your team up for armoured enemies (mostly Crushers and Maulers). If you get a fair amount of those, the brittleness stacks will likely save you a few rounds, as well as boosting armor damage of your team on them, and the damage that bleed will do. (bleed ticks, as well as any other status effect that may get on them will benefit from the brittleness)

As a reminder, brittleness is like rending, but directly applies a debuff to the enemy which means that anyone hitting that enemy will get the buff. So it's a group wide armor damage buff to that specific target, to put it in 12 year old simple words.

Puncture is amazing for all the mentionned reasons above. 4 bleed stacks per hit will max it out quickly, work nicely on bosses if you shoot at them, and pair great with brittleness from Shattering Impact for anything that has armor.

Talents

Volley Adept for reload speed on boltgun. Since it has a pretty slow draw and reload time, its nice to have.

Frag grenades being the strongest in most scenarios, is an undoubtful pick. Demolition Stockpile makes you get 1 back every 60s. Make sure to have at least used one of them and have 2 out of 3 grenades, so that you always have the regeneration on cooldown, and don't lose value out of it.

Survivalist is also self explainatory, since the boltgun will be used mostly for when stuff gets serious, or there is a lot of elites and specials, it is a very beneficial ammo source, most of the time.

Voice of Command with gold toughness is a pretty simple pick too. Executionner stance wouldn't benefit much from this build, neither would stealth.

Precision Strikes can be swapped with Determined if you feel like suppression is an issue, though most of the time you'll be hipfiring the boltgun into specials / ogryns, so it's not really that necessary at all, imo. Besides, Precision Strikes also improves melee attacks.

Iron Will makes gunners a lot weaker when at max toughness or gold toughness. And also helps keep that 75%+ toughness cap more often.

Not taking Demolition Team as this build is dedicated to someone who likely won't play Auric Damnation+ yet, which is where Demo Team really shines, to be fair.

Focus Target and Redirect Fire will allow you to boost everyone's damage on priority targets (mostly important for bosses), and to mark enemies either when you have max stacks, or when there are enemies like crushers and such. That way, not only you'll boost damage on those enemies but also provide a damage buff for you and your team, after the marked enemy dies.

Reciprocity and Desperado combined with the knife will let you get pretty consistant crits. The knife by default has 5% crit chance, along with the 5% crit chance roll. Desperado gives a consistant 10% which boosts us to 20% crit chance by default, without any buffs needed. If we dodge just one hit, we'll stack Riposte and a first reciprocity stack, which means 25% extra crit in just one dodge (So 45% total), up to a total of 65% if we max out reciprocity dodges.

This pairs perfectly with Flesh Tearer that puts out 8 bleed stacks per critical hit. You can take care of any enemy with just the knife and its bleeds, and it's also very efficient for bosses. If you are comfortable with bosses, I would recommend mostly using melee against them.

Being able to bleed so much means that just spamming some hits and push attacks into bosses, will kill them at a very decent speed. (besides, every boss aside of the beast of nurgle gives pretty free dodges, which means you can max out reciprocity and get even more crits)

Curios

I recommand going with either 2 stamina Curios and 1 toughness, or 1 stamina curios and 2 toughness. Veteran has a lot of toughness, and will benefit from those.

Combat ability regeneration is a no brain pick. You will benefit from it the most in any run, considering that you will use your shout (ultimate) a lot, and whenever you do, this buff will get you a bit of value. Lets imagine we do a map that takes 20 minutes, and imagine having 3 of those rolls that apply everytime you have your ultimate on cooldown. Big value on the long run.

Stamina Regeneration is the same deal. Whether you run, push or anything using stamina, you will benefit a lot from these rolls. Considering you will do that a lot throughout the run, you will get lots of value from it on an entire map.

2 toughness and 1 sprint efficiency is what I would personally use. Toughness roll is an additional buff, which simply put means that the third roll would have very diminishing returns, and not have as much value as the first or second roll. We already have a lot of toughness and would really not benefit from that roll.

Personally, I prefer to replace it with 1 sprint efficiency roll that will mix in great with our extra stamina, and stamina regeneration. If you prefer you could put Block Reduction

Same reason for Sprint Efficiency as the other rolls, you will consume stamina a lot through each run, and you should use the knife for mobility as well. Having this roll will be valuable on the long run, helping sustain stamina when moving around a lot.

If you do not know how to use the knife for mobility, you can look it up. Otherwise, a simple explaination is to do one light then hold your heavy and tap 1 (or your melee equip key) repetitively. You don't need to spam it, you can just tap it over and over gently.

Doing that will hold your heavy much longer, which for the knife's heavy 2 in particular, runs a lot faster with.

After a while, the game will swap you to heavy 1, just slide as you let go of this one, and repeat heavy 2 holding trick.