CHOKE SLAMMED (shotgun choke variable) (#2488)

Adds a weapon stat called spread_reduction, which is used to reduce the spread of buckshot. Its only applied to the Caravan shotgun and single shot shotgun, giving those guns a further effective range at the cost of making it easier for others to dodge.

code/modules/projectiles/ammunition/_firing.dm

@@ -1,12 +1,15 @@
 //MOJAVE EDIT CHANGE BEGIN - FIRE_CASING
 //obj/item/ammo_casing/proc/fire_casing(atom/target, mob/living/user, params, distro, quiet, zone_override, spread, atom/fired_from) - Mojave EDIT - ORIGINAL
-/obj/item/ammo_casing/proc/fire_casing(atom/target, mob/living/user, params, distro, quiet, zone_override, spread, atom/fired_from, extra_damage, extra_penetration)
+/obj/item/ammo_casing/proc/fire_casing(atom/target, mob/living/user, params, distro, quiet, zone_override, spread, atom/fired_from, extra_damage, extra_penetration, spread_reduction)
+	if(isgun(fired_from))
+		var/obj/item/gun/G = fired_from
+		spread_reduction = G.spread_reduction
+	distro += (variance - spread_reduction)
 	//MOJAVE EDIT CHANGE END
-	distro += variance
 	var/targloc = get_turf(target)
 	//MOJAVE EDIT CHANGE BEGIN - FIRE_CASING
 	//ready_proj(target, user, quiet, zone_override, fired_from) - Mojave EDIT - ORIGINAL
-	ready_proj(target, user, quiet, zone_override, fired_from, extra_damage, extra_penetration)
+	ready_proj(target, user, quiet, zone_override, fired_from, extra_damage, extra_penetration, spread_reduction)
 	//MOJAVE EDIT CHANGE END
 	if(pellets == 1)
 		if(distro) //We have to spread a pixel-precision bullet. throw_proj was called before so angles should exist by now...

code/modules/projectiles/gun.dm

@@ -2,6 +2,12 @@
 #define DUALWIELD_PENALTY_EXTRA_MULTIPLIER 1.4
 #define FIRING_PIN_REMOVAL_DELAY 50
 
+//MS13 EDIT BEGIN
+#define CHOKE_WIDE 0
+#define CHOKE_MODERATE 7
+#define CHOKE_TIGHT 11
+//MS13 EDIT END
+
 /obj/item/gun
 	name = "gun"
 	desc = "It's a gun. It's pretty terrible, though."
@@ -53,6 +59,7 @@
 	//MOJAVE EDIT ADDITION BEGIN - /OBJ/ITEM/GUN
 	var/extra_damage = 0				//Number of damage to add to individual bullets.
 	var/extra_penetration = 0			//Number to add to armor penetration of individual bullets.
+	var/spread_reduction = CHOKE_WIDE //Mostly for shotguns, increases or decreases the variance of buckshot
 	//MOJAVE EDIT ADDITION END
 
 	var/spread = 0 //Spread induced by the gun itself.

mojave/items/guns/weapons/ballistic/revolver.dm

@@ -1,7 +1,7 @@
 //Guns
 /obj/item/gun/ballistic/revolver/ms13/caravan
 	name = "caravan shotgun"
-	desc = "A well worn but reliable double barrel shotgun."
+	desc = "A well worn but reliable double barrel shotgun with a tighter spread than other shotguns."
 	icon_state = "caravan"
 	inhand_icon_state = "caravan"
 	force = 20
@@ -10,6 +10,7 @@
 	slot_flags = ITEM_SLOT_BACK
 	recoil = 1.5
 	slowdown = 0.75
+	spread_reduction = CHOKE_MODERATE
 	mag_type = /obj/item/ammo_box/magazine/internal/shot/ms13/caravan
 	load_sound = 'mojave/sound/ms13weapons/gunsounds/caravan/caravanload2.ogg'
 	load_empty_sound = 'mojave/sound/ms13weapons/gunsounds/caravan/caravanload2.ogg'
@@ -30,6 +31,7 @@
 	inhand_icon_state = "sawedoff"
 	force = 15
 	subtractible_armour_penetration = 0
+	spread_reduction = CHOKE_WIDE
 	fire_delay = 0.5 SECONDS
 	slot_flags = ITEM_SLOT_SUITSTORE | ITEM_SLOT_BELT
 	slowdown = 0.5
@@ -40,7 +42,7 @@
 
 /obj/item/gun/ballistic/revolver/ms13/single
 	name = "single shotgun"
-	desc = "A very cheap and very common lightweight shotgun with only a single round, better make it count."
+	desc = "A very cheap and very common lightweight shotgun with only a single round, better make it count. It has a very tight choke that enhances its effective range."
 	icon_state = "singleshot"
 	inhand_icon_state = "singleshot"
 	force = 20
@@ -49,6 +51,7 @@
 	slot_flags = ITEM_SLOT_BACK
 	recoil = 1.5
 	slowdown = 0.75
+	spread_reduction = CHOKE_TIGHT
 	mag_type = /obj/item/ammo_box/magazine/internal/shot/ms13/single
 	load_sound = 'mojave/sound/ms13weapons/gunsounds/caravan/caravanload2.ogg'
 	load_empty_sound = 'mojave/sound/ms13weapons/gunsounds/caravan/caravanload2.ogg'