Warhammer 40000: Boltgun – Machine Spirit Upgrade Guide

An explanation of the Machine Spirit power up for each weapon. Does not include MS locations.



Playing through Boltgun, you probably ran across some of those silly green skulls that make your guns glow. But what does that mean? What does it do? Why do I have the sudden urge to replace my fleshy bits with superior mechanical augmentations? The answers to these questions lie ahead!

Note: This guide is not a “secrets” guide and will not discuss Spirit locations. In addition, spoilers for the weapons of Boltgun lie ahead, along with some of the enemies – so stop reading if you want to be surprised by what is in the game! Finally, these upgrades were tested on Hard difficulty, so any personal opinions I give are based on that difficulty.

What is the Machine Spirit?

The Machine Spirit is a collectible that can be found in Boltgun, upgrading your currently equipped weapon on pickup. The upgrades differ depending on the weapon, and range from immediately obvious to “did that even change anything?” These upgrades last for a single level, and there is generally only one per level. Make sure you have the right weapon equipped when you walk over it!


The titular boltgun is a well-rounded weapon. It has a good magazine capacity, good accuracy, and a respectable strength of 4, allowing it to easily deal with cultists and even stand up to Chaos marines if necessary. Being the “standard” weapon of the game, it gets the easiest to notice and understand upgrade:

  • Strength increases from 4 to 5.
  • Magazine capacity increases from 25 to 45. Note that while the amount of ammo you can carry doesn’t increase, it does technically increase by 20 if you have full ammo, due to the magazine holding more.

These upgrades make the boltgun even more useful, able to become a real threat to toughness 4 enemies (such as Chaos Marines) and absolutely shredding toughness 3 enemies. The increased magazine capacity is just icing on the cake, and I personally find that blessing the boltgun is never a bad idea and is generally my go-to choice.


The shotgun occupies an interesting space. It is only strength 3, but can do some serious damage if all or most of your pellets hit a target, even threatening Chaos marines if you know no fear and get right in their faces. Anything tougher than 4, however, and the shotgun really starts to struggle. It should be noted that it has surprisingly good range if you’re just aiming to take out cultists. The shotgun’s Spirit is also fairly obvious, but has a couple of more obscure features:

  • Dramatic increase in the number of pellets fired
  • Pellets bounce once upon hitting a surface, but not on hitting enemies – the bouncing pellets can hit and damage you




The shotgun’s Spirit really increases its usefulness, but it still struggles against tougher enemies and now has the added drawback of potentially hurting yourself. It’s a fun one to use, especially if you want to turn the room into a bullet hell, but not one I would suggest over the boltgun.

Plasma Gun

The plasma gun occupies an interesting space. When you first find it, it will be your go-to for fighting terminators and marines, but it quickly starts to fall off as you acquire more weapons that do the job just as well, if not better. The primary advantage of the plasma gun is that it shoots quite fast if you hold the fire button down, but this leads to a thematically-appropriate but annoying overheat mechanic, where you start to take some damage from the gun. Luckily, the Omnissiah has your back with the following upgrades:

  • Fuel canister capacity increases from 12 to 18. Note that, like the boltgun, the amount of ammo you can carry doesn’t increase, though it does technically increase by 6 if you have full ammo, due to the canister holding more.
  • The weapon no longer overheats.
  • Fire rate is slightly increased.

Yep, pretty much every disadvantage the gun has is removed and it can easily become a mainstay of your arsenal. With plasma ammo being fairly common (and dropped by a couple of enemies!), upgrading the plasma gun is a good idea. It is still held back a bit by its low maximum ammo, but it can’t be perfect.

Nice and cool.

Heavy Bolter

Don’t let its strength of 5 fool you, the heavy bolter is fantastic at fighting anything. It has great DPS and never has to reload, along with holding quite a bit of ammo. It does have two downsides, however. First is that much like a typical video game minigun, the heavy bolter has a “spin-up” time – except in this case it’s your stalwart sternguard raising the massive weapon to fire it, instead of a motor revving up! The second problem is that your walking and sprint speeds are both reduced while firing. So what does the Spirit do? Fixes that!

  • Speed penalty while firing is removed.

This is very useful for some of the more frenetic later stage “purge” fights, as you can keep full mobility while tearing into enemies. The only downside is that it takes a while to build heavy bolter ammo back up, so it isn’t the best weapon to use for general fights. It also still has its “spin-up” time and frankly has so much muzzle blast and so many ejecting shells that it can be hard to keep track of what’s going on when you’re also zipping around at full speed! That said, weigh carefully if the increase in mobility is better than the increase in damage that many other weapons get.

Fun fact: firing the heavy bolter pushes you back very slowly.

Vengeance Launcher

A returning weapon first introduced in Space Marine (which Boltgun is a loose sequel to – go play Space Marine, it rocks) which hasn’t yet made an appearance in the wider Warhammer canon, the vengeance launcher is a weird one. It fires sticky grenades on a flat trajectory that explode after a couple of seconds, dealing damage to their target and anything around the grenade. They also stick to the environment and cause minor damage when they hit an enemy. Despite only being strength 3, the vengeance launcher fires quickly and, as long as you don’t mind the delay, is surprisingly versatile. Of note is that the grenades do hurt you when they explode, so don’t get too cute sticking an entire cylinder into that aspiring champion charging you. The upgrade for the vengeance launcher is incredibly subtle:

  • Larger explosion radius.

Honestly, I may not even be correct. I can’t quite put my finger on what it does. It doesn’t explode faster. It doesn’t gain strength or ammo. It doesn’t fire faster. If anyone has any idea, let me know in the comments!

This explosion looks bigger, right?


The meltagun returns in its “super-shotgun” form first seen in Space Marine. The meltagun is a power weapon, plain and simple. It kills anything other than bosses very quickly and at surprisingly long ranges. It also over-penetrates and goes through scenery elements. Its biggest downside? Only 8 shots total (don’t be fooled by the ammo counter, it uses 5 fuel for each shot). However, ammo eventually becomes somewhat common for it, and it can immediately turn a losing fight into a resounding victory. Its upgrade is subtle, but immensely powerful:

  • One more beam is added to the burst. (Or, in shotgun terms, it gains a pellet.)

5 beams.

6 beams.

This simple modification makes the gun even more powerful… but does it need to be? Unless you KNOW you’re heading into a boss fight, it may be a bit overkill and you are probably better served upgrading a more general purpose gun.

Fun fact, the meltagun also shoots a blast BEHIND you. I didn’t realize this until testing for this guide, and it happens whether or not the gun is upgraded. Very random, and possibly a bug? I have not tested whether or not these backshots do damage.

I was standing in the middle of that little room and ran out to grab this screenshot.

Pointless note: The meltagun in 40k has traditionally been strength 8, not 7. I figure they reduced it to not make it gain extra bonus damage on bosses/not have to make bosses T8, which would wreck the balance.

Volkite Caliver

Imagine my surprise when a weapon popularized by Warhammer 30,000 appeared in this game! The original Martian death ray, the volkite caliver fires a long-range beam that damages enemies as long as it is held on them. Enemies killed by the caliver explode, removing the need to carefully gib pink horrors and aspiring champions and damaging nearby enemies! It’s a great weapon and very versatile, though requiring the beam to be held on target can lead to some dangerous situations. It has one of the more subtle upgrade in the game:

  • The gun “pulses” roughly every second, doing a burst of damage to its target.

The pulse damage is not insignificant, and is a great way to deal with enemies faster than keeping the beam on them normally would allow you. I personally quite like the volkite caliver, and the extra damage saves time and ammunition. I just wish there were some outward change in the gun’s animations or art to let you know that something is happening.

Grav Cannon

An interesting choice of weapon to add to the game, it effectively functions as Boltgun’s BFG. It fires a beam like the volkite caliver, but the end of the beam emits a large radius of incredible damage (even if it hits the environment). It uses ammo in the same manner as the heavy bolter, so it has a single pool it draws from until empty. The problem is, it’s so damn powerful I can’t actually tell what the upgrade does! It doesn’t seem to use ammo less quickly, it doesn’t seem to gain damage (though that would be very difficult to tell outside of taking it to a boss fight), and it doesn’t gain any neat tricks like the volkite caliver as far as I can tell. The closest I have been able to figure out is:

  • The radius of damage gets larger. I think.

Please let me know in the comments if you actually know what this does!

Thanks to CrazyThang for his excellent guide, all credits belong to his effort. if this guide helps you, please support and rate it via Steam Community. enjoy the game.

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About Robins Chew

I'm Robins, who love to play the mobile games from Google Play, I will share the gift codes in this website, if you also love mobile games, come play with me. Besides, I will also play some video games relresed from Steam.

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