Machine Gun Rules?


Homebrew and House Rules


How does an automatic weapon's attack work? Would it ignore the iterative attacks granted by your BAB in favore of its own?

Say Miguolio the goblin, who has a BAB of +6/+1, picks up a gattling gun that has a fire rate of 8 shots and makes an attack. Clearly, he wouldn't just get 2 shots off, so what do?

The house rule I have in place is that he can fire all 8 shots, but the iterative attacks allow him to split up the shots however he chooses between different enemies.

If you guys have a better idea, please let me know! I havent read d20 modern, so I dont know what that says on the subject.


There is a bit about automatic weapons in the latest reign of winter ap. I don't have access to it at the moment though.


I've been wondering this myself. Maybe it would just be represented by adding a bunch to your attack bonus, to represent the multiple shots in such a short moment?

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If it's a spray and pray type weapon, I'd make it work more like an AOE line with reflex for half.

Dark Archive

Depends on how they shot it. in D20modern i think (don't remember for sure) that it was a full attack action to fire on automatic. but if they aim it at just one target, its a to hit with more damage dice, depending on the number of bullets. or if the spray it around its more like a cone or flat sheet, with a reflex roll to avoid/half instead of a to hit roll. But i could be mixing systems. traveller, d20moder/future and Shadowrun.
The RoF book treats it as a line attack with a to hit roll. it fires 10 bullets, with each target in the line effect being attaked by 1 bullet with a -2 to hit for recoil, does 2d8 damage, and cant be modified by precision damage or damage modifying effect like vital strike.


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Adventure Path Charter Subscriber; Pathfinder Rulebook, Starfinder Adventure Path, Starfinder Roleplaying Game, Starfinder Society Subscriber
Pathfinder AP #71, Rasputin Must Die! wrote:
Automatic Weapon Quality: A weapon with the automatic weapon quality fires a burst of bullets with a single pull of the trigger, attacking all creatures in a line. This line starts from any corner of your space and extends to the limit of the weapon’s range or until it strikes a barrier it cannot penetrate. When an automatic weapon attacks all creatures in a line, it makes a separate attack roll against each creature in the line. Each creature in the line can only be attacked with one bullet from each burst. Each attack roll takes a –2 penalty to account for recoil, and its attack damage cannot be modified by precision damage or damage-increasing feats such as Vital Strike. Effects that grant concealment, such as fog or smoke, or the blur, invisibility, or mirror image spells, do not foil an automatic weapon’s line attack. If any of the attack rolls threaten a critical hit, confirm the critical for that attack roll alone. An automatic weapon misfires only if all of the attack rolls made misfire. A single attack with an automatic weapon fires 10 bullets. An automatic weapon cannot fire single bullets that target one creature. When taking a full-attack action with an automatic weapon, you can fire as many bursts in a round as you have attacks.


Dragonchess Player wrote:
Pathfinder AP #71, Rasputin Must Die! wrote:
Automatic Weapon Quality: A weapon with the automatic weapon quality fires a burst of bullets with a single pull of the trigger, attacking all creatures in a line. This line starts from any corner of your space and extends to the limit of the weapon’s range or until it strikes a barrier it cannot penetrate. When an automatic weapon attacks all creatures in a line, it makes a separate attack roll against each creature in the line. Each creature in the line can only be attacked with one bullet from each burst. Each attack roll takes a –2 penalty to account for recoil, and its attack damage cannot be modified by precision damage or damage-increasing feats such as Vital Strike. Effects that grant concealment, such as fog or smoke, or the blur, invisibility, or mirror image spells, do not foil an automatic weapon’s line attack. If any of the attack rolls threaten a critical hit, confirm the critical for that attack roll alone. An automatic weapon misfires only if all of the attack rolls made misfire. A single attack with an automatic weapon fires 10 bullets. An automatic weapon cannot fire single bullets that target one creature. When taking a full-attack action with an automatic weapon, you can fire as many bursts in a round as you have attacks.

That sounds the most legit, me thinks. I think Ill modify it so that you can apply your strength modifier instead of dex to counter recoil, and critical fails stop the attack, simulating a jam.


I would also add that not all automatic guns are the same. There is a huge difference between a small gun like an uzi (capable of holding up to 50 rounds, which could all be fired within 6 seconds), compared to a heavier gun like the German MG42 (can fire 1,200 rnds/minute, or 120 per 6 second combat round)!


Fergie wrote:
I would also add that not all automatic guns are the same. There is a huge difference between a small gun like an uzi (capable of holding up to 50 rounds, which could all be fired within 6 seconds), compared to a heavier gun like the German MG42 (can fire 1,200 rnds/minute, or 120 per 6 second combat round)!

In Pathfinder, all automatic weapons are the same, per above rule. It's already crazy enough to have WWI-WWII era firearms. Let's not get crazy and build an entire weapons table for them.


I think at that point, you may just chalk it up to adding more damage dice. A weapon like that would have enough d12s to turn you into salsa even if they came up all ones.


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Barry Armstrong wrote:
Fergie wrote:
I would also add that not all automatic guns are the same. There is a huge difference between a small gun like an uzi (capable of holding up to 50 rounds, which could all be fired within 6 seconds), compared to a heavier gun like the German MG42 (can fire 1,200 rnds/minute, or 120 per 6 second combat round)!
In Pathfinder, all automatic weapons are the same, per above rule. It's already crazy enough to have WWI-WWII era firearms. Let's not get crazy and build an entire weapons table for them.

No. Let's get crazy. This is the homebrew section, right?


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Vamptastic wrote:
Barry Armstrong wrote:
Fergie wrote:
I would also add that not all automatic guns are the same. There is a huge difference between a small gun like an uzi (capable of holding up to 50 rounds, which could all be fired within 6 seconds), compared to a heavier gun like the German MG42 (can fire 1,200 rnds/minute, or 120 per 6 second combat round)!
In Pathfinder, all automatic weapons are the same, per above rule. It's already crazy enough to have WWI-WWII era firearms. Let's not get crazy and build an entire weapons table for them.
No. Let's get crazy. This is the homebrew section, right?

I believe Super Genius Games (anachronistic adventurers) and Game Room Creations (modern path) have enough guns and gun rules to have an anachronistic modern fantasy shootout! (Complete with +3 Uzi of Fireball spell! Okay, not really... but it's possible!)


The Annihilator Robot from the Inner Sea Bestiary has chain guns that may attack in a cone.


Doctor Necrotic wrote:
I believe Super Genius Games (anachronistic adventurers) and Game Room Creations (modern path) have enough guns and gun rules to have an anachronistic modern fantasy shootout! (Complete with +3 Uzi of Fireball spell! Okay, not really... but it's possible!)

Indeed they do. The SGG product with full-auto rules is AA: The Enforcer. Either rules-set is perfectly playable.

Lantern Lodge

Coyote_Ragtime wrote:
I think at that point, you may just chalk it up to adding more damage dice. A weapon like that would have enough d12s to turn you into salsa even if they came up all ones.

If DR applied to each one, that would change things considerably.


An alternative that might be interesting would be to make a single attack roll and for each successive shot remove -1 from the to hit amount allowing you to change targets at will.

Improve skill would reduce the speed of the reduction from 1/-1 to 2/-1 and so on to the maximum number of shots /round.

Just my crazy idea.

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