why is my gun jamming on the first mag?

DangerRevolution · June 8, 2025, 10:36pm

i don’t understand this mechanic because i can go 100 hours with never once having my gun jam and then for some reason, maybe it’s corruption RP or maybe the QM really fucking hates me OOC but he hands me some horseshit cardboard cutout that jams every 1/3rd of a mag FROM THE FIRST MAG why why why why. i clear the jam and get back into playing the game and it jams again and metagaming Xenos drag away their wounded comrade?? Game about shooting and my gun doesn’t shoot…

RainbowStalin · June 8, 2025, 10:37pm

Okay but actually though. Why the fuck did my first 5 bullets fucking jam.

dryramen · June 8, 2025, 10:49pm

skill issue

Skycrafter · June 8, 2025, 10:52pm

Its been said its a bug thats just not been fixed.

ihatethisengine · June 8, 2025, 10:52pm

I think I figured this out.

github.com/cmss13-devs/cmss13

code/modules/projectiles/gun.dm

c3d0f3967


      
          //	to_chat(user, SPAN_WARNING("[src] jammed! You'll need a second to get it fixed!"))
          
          //----------------------------------------------------------
          		//    \\
          		// FIRE BULLET AND POINT BLANK/SUICIDE \\
          		//    \\
          		//    \\
          //----------------------------------------------------------
          
          /obj/item/weapon/gun/proc/Fire(atom/target, mob/living/user, params, reflex = FALSE, dual_wield)
          	var/gunjammed = handle_jam_fire(user)
          	set waitfor = FALSE
          	if(gunjammed == NONE)
          		return NONE
          
          	if(!able_to_fire(user) || !target || !get_turf(user) || !get_turf(target))
          		return NONE
          
          	update_gun_durability()
          
          	/*

The jamming function (where it not only decides whether the weapon will jam or not, but also reduces the weapon durability) is called before checking whether the weapon is able to fire or not.

So every time you click the jamming roll happens and the gun’s durability is reduced. So if you have high clicks per second, you are going to have more jamming rolls for no reason, and also you lose durability with every click. I’m too lazy to test my theory, but it seems to be true.

(Don’t look at update_gun_durability() function it does not matter)

bird_bird_bird · June 8, 2025, 11:29pm

ermmmmm maybe try getting better???
all these so called marine “pros” yet they’ve never unga’d a day in their life, sighhhhhhhhh

Nihisohel · June 9, 2025, 12:16am

its a bug that i havent bothered to fix since the durability removal pr followed immediately after

although, most other players seem to claim that its a mechanic and not a bug otherwise

Nihisohel · June 9, 2025, 12:19am

no, the issue is specifically from the handle_jam_fire calculations, not the check for jamming itself which in my shitcodery doesn’t prevent jamming above the weapons jam threshold, which is typically <79 for most and <50 for others

samson · June 9, 2025, 1:12am

mods for his insolence make him play marine all day during the 2 larva per cap changes

Nihisohel · June 9, 2025, 3:47am

id still win bro

ihatethisengine · June 9, 2025, 9:16am

The fuck you mean “no”?

github.com/cmss13-devs/cmss13

code/modules/projectiles/gun.dm

c3d0f3967


      
          	var/bullet_duraloss = 0.05 // if there isnt a traditional projectile, then we need to return something for the calculation, otherwise itll runtime
          	var/bullet_duramage = BULLET_DURABILITY_DAMAGE_DEFAULT // for guns that dont fire bullets traditionally e.g. flamer, lets make sure they actually lose durability by default
          	if(in_chamber && in_chamber.ammo)
          		bullet_duraloss = in_chamber.ammo.bullet_duraloss
          		bullet_duramage = in_chamber.ammo.bullet_duramage
          	else if(ammo) // apparently certain guns like the mou dont have a chamber but uses its ammo directly from the magazine so this is required
          		bullet_duraloss = ammo.bullet_duraloss
          		bullet_duramage = ammo.bullet_duramage
          
          	if(prob(durability_loss + bullet_duraloss)) // probability durability loss dependent on weapon value, rngesus woe
          		set_gun_durability(gun_durability - bullet_duramage) // decrement durability based on bullet durability damage each time the gun is fired
          		update_gun_durability()
          		check_worn_out(user)
          
          	if(gun_durability < jam_threshold)
          		scaled_jam_chance = initial_jam_chance * ((jam_threshold - gun_durability) ** 0.75) // exponentially scale jam chance by 3/4ths based on durability after passing weapons jam threshold
          	else
          		scaled_jam_chance = 0
          
          	if(check_jam(user) == NONE)
          		return NONE

You lower the gun’s durability BEFORE checking if the gun is able to shoot in the first place. Re-read my message. Multiple times if possible. You annoyed me so much with your “no” I had to test this, look at the result:

(even funnier actually)

Here is me losing durability without firing a single shot. I set the fire_delay to 999999. This means all the rolls are happening without a SINGLE shot. So the gun can lose durability and jam without even being able to shoot. BECAUSE YOU DON’T CHECK IF THE GUN IS ABLE TO SHOOT BEFORE LOWERING DURABILITY AND ROLLING FOR JAM. So even if you have only 1% chance to jam, since it rolls with every click not with every shot the probability increases by a lot. Just like I said. Honestly, I am disappointed man. I gave you answers on a silver plate and you were so dismissive you just said “no” without even thinking for a moment.

Nihisohel · June 9, 2025, 3:04pm

i didnt mean to disregard your findings with literally just no, i mean that specifically what the OPs issue pertains to is from the calculation itself, not by whatever digression you decided with at the time and rail me with it

EmpressEri · June 9, 2025, 4:49pm

Jesus fucking christ… THEY DIDN’T THINK OF THIS?!

BasilHerb · June 11, 2025, 4:39pm

I mean, no one’s omniscient. Bugs are bugs, perfectly understandable