Adds the XM51 Breaching Scattergun

code/datums/ASRS.dm

@@ -66,6 +66,14 @@
 	reference_package = /datum/supply_packs/ammo_shell_box_flechette
 	cost = ASRS_VERY_LOW_WEIGHT
 
+/datum/supply_packs_asrs/ammo_shell_box_breaching
+	reference_package = /datum/supply_packs/ammo_shell_box_breaching
+	cost = ASRS_LOW_WEIGHT
+
+/datum/supply_packs_asrs/ammo_xm51
+	reference_package = /datum/supply_packs/ammo_xm51
+	cost = ASRS_VERY_LOW_WEIGHT
+
 /datum/supply_packs_asrs/ammo_smartgun
 	reference_package = /datum/supply_packs/ammo_smartgun
 

code/datums/ammo/bullet/shotgun.dm

@@ -309,6 +309,36 @@
 	penetration = ARMOR_PENETRATION_TIER_10
 	scatter = SCATTER_AMOUNT_TIER_4
 
+/*
+					16 GAUGE SHOTGUN AMMO
+*/
+
+/datum/ammo/bullet/shotgun/light/breaching
+	name = "light breaching shell"
+	icon_state = "flechette"
+	handful_state = "breaching_shell"
+	multiple_handful_name = TRUE
+	bonus_projectiles_type = /datum/ammo/bullet/shotgun/light/breaching/spread
+
+	accuracy_var_low = PROJECTILE_VARIANCE_TIER_4
+	accuracy_var_high = PROJECTILE_VARIANCE_TIER_4
+	damage = 20
+	max_range = 5
+	damage_falloff = DAMAGE_FALLOFF_TIER_6
+	effective_range_max = EFFECTIVE_RANGE_MAX_TIER_1
+
+	penetration = ARMOR_PENETRATION_TIER_6
+	bonus_projectiles_amount = EXTRA_PROJECTILES_TIER_3
+
+/datum/ammo/bullet/shotgun/light/breaching/spread
+	name = "additional light breaching fragments"
+	bonus_projectiles_amount = 0
+	accuracy_var_low = PROJECTILE_VARIANCE_TIER_6
+	accuracy_var_high = PROJECTILE_VARIANCE_TIER_6
+	scatter = SCATTER_AMOUNT_TIER_2
+	damage_falloff = DAMAGE_FALLOFF_TIER_6
+	damage = 10
+
 //Enormous shell for Van Bandolier's superheavy double-barreled hunting gun.
 /datum/ammo/bullet/shotgun/twobore
 	name = "two bore bullet"

code/datums/supply_packs/ammo.dm

@@ -240,6 +240,16 @@
 	containername = "\improper shotgun flechette crate"
 	group = "Ammo"
 
+/datum/supply_packs/ammo_shell_box_breaching
+	name = "Shell box (16g) (120x breaching shells)"
+	contains = list(
+		/obj/item/ammo_box/magazine/shotgun/light/breaching,
+	)
+	cost = 40
+	containertype = /obj/structure/closet/crate/ammo
+	containername = "\improper shotgun breaching crate"
+	group = "Ammo"
+
 //------------------------For 88M4 ----------------
 
 /datum/supply_packs/ammo_mod88_mag_box_ap
@@ -296,6 +306,18 @@
 	containername = "\improper M41AE2 HPR holo-target magazines crate"
 	group = "Ammo"
 
+/datum/supply_packs/ammo_xm51
+	contains = list(
+		/obj/item/ammo_magazine/rifle/xm51,
+		/obj/item/ammo_magazine/rifle/xm51,
+		/obj/item/ammo_magazine/shotgun/light/breaching,
+	)
+	name = "XM51 Ammo (2x mags) (1x small breaching shell box)"
+	cost = 20
+	containertype = /obj/structure/closet/crate/ammo
+	containername = "\improper XM51 ammo crate"
+	group = "Ammo"
+
 //------------------------Smartgunner stuff----------------
 
 /datum/supply_packs/ammo_smartgun_battery_pack

code/datums/supply_packs/weapons.dm

@@ -60,7 +60,18 @@
 	)
 	cost = 30
 	containertype = /obj/structure/closet/crate/weapon
-	containername = "MOU-53 Breack Action Shotgun Crate"
+	containername = "MOU-53 Break Action Shotgun Crate"
+	group = "Weapons"
+
+/datum/supply_packs/xm51
+	name = "XM51 Breaching Scattergun Crate (x2)"
+	contains = list(
+		/obj/item/storage/box/guncase/xm51,
+		/obj/item/storage/box/guncase/xm51,
+	)
+	cost = 30
+	containertype = /obj/structure/closet/crate/weapon
+	containername = "XM51 Breaching Scattergun Crate"
 	group = "Weapons"
 
 /datum/supply_packs/smartpistol

code/game/machinery/vending/vendor_types/requisitions.dm

@@ -41,6 +41,7 @@
 		list("M2C Heavy Machine Gun", round(scale * 2), /obj/item/storage/box/guncase/m2c, VENDOR_ITEM_REGULAR),
 		list("M240 Incinerator Unit", round(scale * 2), /obj/item/storage/box/guncase/flamer, VENDOR_ITEM_REGULAR),
 		list("M79 Grenade Launcher", round(scale * 3), /obj/item/storage/box/guncase/m79, VENDOR_ITEM_REGULAR),
+		list("XM51 Breaching Scattergun", round(scale * 2.5), /obj/item/storage/box/guncase/xm51, VENDOR_ITEM_REGULAR),
 
 		list("EXPLOSIVES", -1, null, null),
 		list("M15 Fragmentation Grenade", round(scale * 2), /obj/item/explosive/grenade/high_explosive/m15, VENDOR_ITEM_REGULAR),
@@ -244,11 +245,13 @@
 		list("M41A MK1 AP Magazine (10x24mm)", round(scale * 2), /obj/item/ammo_magazine/rifle/m41aMK1/ap, VENDOR_ITEM_REGULAR),
 		list("M56D Drum Magazine", round(scale * 2), /obj/item/ammo_magazine/m56d, VENDOR_ITEM_REGULAR),
 		list("M2C Box Magazine", round(scale * 2), /obj/item/ammo_magazine/m2c, VENDOR_ITEM_REGULAR),
+		list("XM51 Magazine (16g)", round(scale * 3), /obj/item/ammo_magazine/rifle/xm51, VENDOR_ITEM_REGULAR),
 
 		list("SHOTGUN SHELL BOXES", -1, null, null),
 		list("Shotgun Shell Box (Buckshot x 100)", round(scale * 2), /obj/item/ammo_box/magazine/shotgun/buckshot, VENDOR_ITEM_REGULAR),
 		list("Shotgun Shell Box (Flechette x 100)", round(scale * 2), /obj/item/ammo_box/magazine/shotgun/flechette, VENDOR_ITEM_REGULAR),
 		list("Shotgun Shell Box (Slugs x 100)", round(scale * 2), /obj/item/ammo_box/magazine/shotgun, VENDOR_ITEM_REGULAR),
+		list("Shotgun Shell Box (16g) (Breaching x 120)", 1, /obj/item/ammo_box/magazine/shotgun/light/breaching, VENDOR_ITEM_REGULAR),
 		)
 
 /obj/structure/machinery/cm_vending/sorted/cargo_ammo/stock(obj/item/item_to_stock, mob/user)

code/game/machinery/vending/vendor_types/squad_prep/squad_prep.dm

@@ -246,6 +246,7 @@
 		list("M240 Incinerator Tank", round(scale * 3), /obj/item/ammo_magazine/flamer_tank, VENDOR_ITEM_REGULAR),
 		list("M56D Drum Magazine", round(scale * 2), /obj/item/ammo_magazine/m56d, VENDOR_ITEM_REGULAR),
 		list("M2C Box Magazine", round(scale * 2), /obj/item/ammo_magazine/m2c, VENDOR_ITEM_REGULAR),
+		list("Box of Breaching Shells (16g)", round(scale * 2), /obj/item/ammo_magazine/shotgun/light/breaching, VENDOR_ITEM_REGULAR),
 		list("HIRR Baton Slugs", round(scale * 6), /obj/item/explosive/grenade/slug/baton, VENDOR_ITEM_REGULAR),
 		list("M74 AGM-S Star Shell", round(scale * 4), /obj/item/explosive/grenade/high_explosive/airburst/starshell, VENDOR_ITEM_REGULAR),
 		list("M74 AGM-S Hornet Shell", round(scale * 4), /obj/item/explosive/grenade/high_explosive/airburst/hornet_shell, VENDOR_ITEM_REGULAR),

code/game/objects/items/stacks/sheets/sheet_types.dm

@@ -258,6 +258,8 @@ GLOBAL_LIST_INIT_TYPED(cardboard_recipes, /datum/stack_recipe, list ( \
 		new/datum/stack_recipe("empty magazine box (M41A Incen)", /obj/item/ammo_box/magazine/incen/empty), \
 		new/datum/stack_recipe("empty magazine box (M41A LE)", /obj/item/ammo_box/magazine/le/empty), \
 		null, \
+		new/datum/stack_recipe("empty magazine box (XM51)", /obj/item/ammo_box/magazine/xm51/empty), \
+		null, \
 		new/datum/stack_recipe("empty magazine box (M41A MK1)", /obj/item/ammo_box/magazine/mk1/empty), \
 		new/datum/stack_recipe("empty magazine box (M41A MK1 AP)", /obj/item/ammo_box/magazine/mk1/ap/empty), \
 		null, \
@@ -280,6 +282,7 @@ GLOBAL_LIST_INIT_TYPED(cardboard_recipes, /datum/stack_recipe, list ( \
 		new/datum/stack_recipe("empty shotgun shell box (Incendiary)", /obj/item/ammo_box/magazine/shotgun/incendiary/empty), \
 		new/datum/stack_recipe("empty shotgun shell box (Incendiary Buckshot)", /obj/item/ammo_box/magazine/shotgun/incendiarybuck/empty), \
 		new/datum/stack_recipe("empty shotgun shell box (Slugs)", /obj/item/ammo_box/magazine/shotgun/empty), \
+		new/datum/stack_recipe("empty shotgun shell box (16g) (Breaching)", /obj/item/ammo_box/magazine/shotgun/light/breaching/empty), \
 		null, \
 		new/datum/stack_recipe("empty 45-70 bullets box", /obj/item/ammo_box/magazine/lever_action/empty), \
 		new/datum/stack_recipe("empty 45-70 bullets box (Blanks)", /obj/item/ammo_box/magazine/lever_action/training/empty), \

code/game/objects/items/storage/belt.dm

@@ -903,6 +903,7 @@
 	var/drawSound = 'sound/weapons/gun_pistol_draw.ogg'
 	///Used to get flap overlay states as inserting a gun changes icon state.
 	var/base_icon
+	var/gun_has_gamemode_skin
 	can_hold = list(
 		/obj/item/weapon/gun/pistol,
 		/obj/item/ammo_magazine/pistol,
@@ -965,7 +966,17 @@
 		sure that we don't have to do any extra calculations.
 		*/
 		playsound(src, drawSound, 7, TRUE)
-		var/image/gun_underlay = image(icon, current_gun.base_gun_icon)
+		var/image/gun_underlay
+		if(gun_has_gamemode_skin)
+			switch(SSmapping.configs[GROUND_MAP].camouflage_type)
+				if("snow")
+					gun_underlay = image(icon, "s_" + current_gun.base_gun_icon)
+				if("desert")
+					gun_underlay = image(icon, "d_" + current_gun.base_gun_icon)
+				if("classic")
+					gun_underlay = image(icon, "c_" + current_gun.base_gun_icon)
+		else
+			gun_underlay = image(icon, current_gun.base_gun_icon)
 		gun_underlay.pixel_x = holster_slots[slot]["icon_x"]
 		gun_underlay.pixel_y = holster_slots[slot]["icon_y"]
 		gun_underlay.color = current_gun.color
@@ -1186,6 +1197,24 @@
 			"icon_x" = -11,
 			"icon_y" = -5))
 
+/obj/item/storage/belt/gun/xm51
+	name = "\improper M276 pattern XM51 holster rig"
+	desc = "The M276 is the standard load-bearing equipment of the USCM. It consists of a modular belt with various clips. This version is for the XM51 breaching scattergun, along with two pouches for spare magazines or shells."
+	icon_state = "xm51_holster"
+	has_gamemode_skin = TRUE
+	gun_has_gamemode_skin = TRUE
+	storage_slots = 3
+	max_w_class = 5
+	can_hold = list(
+		/obj/item/weapon/gun/rifle/xm51,
+		/obj/item/ammo_magazine/rifle/xm51,
+		/obj/item/ammo_magazine/handful,
+	)
+	holster_slots = list(
+		"1" = list(
+			"icon_x" = 9,
+			"icon_y" = -2))
+
 /obj/item/storage/belt/gun/m44
 	name = "\improper M276 pattern M44 holster rig"
 	desc = "The M276 is the standard load-bearing equipment of the USCM. It consists of a modular belt with various clips. This version is for the M44 magnum revolver, along with six small pouches for speedloaders. It smells faintly of hay."

code/modules/cm_marines/equipment/guncases.dm

@@ -348,6 +348,19 @@
 	new /obj/item/device/vulture_spotter_scope/skillless(src, WEAKREF(rifle))
 	new /obj/item/tool/screwdriver(src) // Spotter scope needs a screwdriver to disassemble
 
+/obj/item/storage/box/guncase/xm51
+	name = "\improper XM51 breaching scattergun case"
+	desc = "A gun case containing the XM51 Breaching Scattergun. Comes with two spare magazines, an optional stock and a belt to holster the weapon in."
+	storage_slots = 5
+	can_hold = list(/obj/item/weapon/gun/rifle/xm51, /obj/item/ammo_magazine/rifle/xm51, /obj/item/storage/belt/gun/xm51, /obj/item/attachable/stock/xm51)
+
+/obj/item/storage/box/guncase/xm51/fill_preset_inventory()
+	new /obj/item/attachable/stock/xm51(src)
+	new /obj/item/weapon/gun/rifle/xm51(src)
+	new /obj/item/ammo_magazine/rifle/xm51(src)
+	new /obj/item/ammo_magazine/rifle/xm51(src)
+	new /obj/item/storage/belt/gun/xm51(src)
+
 //Handgun case for Military police vendor three mag , a railflashligh and the handgun.
 
 //88 Mod 4 Combat Pistol

code/modules/projectiles/ammo_boxes/handful_boxes.dm

@@ -68,6 +68,20 @@
 /obj/item/ammo_box/magazine/shotgun/beanbag/empty
 	empty = TRUE
 
+
+//-----------------------16 GAUGE SHOTGUN SHELL BOXES-----------------------
+
+/obj/item/ammo_box/magazine/shotgun/light/breaching
+	name = "\improper 16-gauge shotgun shell box (Breaching x 120)"
+	icon_state = "base_breach"
+	overlay_content = "_breach"
+	magazine_type = /obj/item/ammo_magazine/shotgun/light/breaching
+	num_of_magazines = 120 //10 full mag reloads.
+	can_explode = FALSE
+
+/obj/item/ammo_box/magazine/shotgun/light/breaching/empty
+	empty = TRUE
+
 //-----------------------R4T Lever-action rifle handfuls box-----------------------
 
 /obj/item/ammo_box/magazine/lever_action

code/modules/projectiles/ammo_boxes/magazine_boxes.dm

@@ -170,6 +170,19 @@
 /obj/item/ammo_box/magazine/m4ra/heap/empty
 	empty = TRUE
 
+//-----------------------XM51 Breaching Scattergun Mag Box-----------------------
+
+/obj/item/ammo_box/magazine/xm51
+	name = "\improper magazine box (XM51 x 8)"
+	icon_state = "base_breach"
+	flags_equip_slot = SLOT_BACK
+	overlay_gun_type = "_xm51"
+	num_of_magazines = 8
+	magazine_type = /obj/item/ammo_magazine/rifle/xm51
+
+/obj/item/ammo_box/magazine/xm51/empty
+	empty = TRUE
+
 //-----------------------L42A Battle Rifle Mag Boxes-----------------------
 
 /obj/item/ammo_box/magazine/l42a

code/modules/projectiles/gun_attachables.dm

@@ -2100,6 +2100,43 @@ Defined in conflicts.dm of the #defines folder.
 	flags_attach_features = NO_FLAGS
 	hud_offset_mod = 2
 
+/obj/item/attachable/stock/xm51
+	name = "\improper XM51 stock"
+	desc = "A specialized stock designed for XM51 breaching shotguns. Helps the user absorb the recoil of the weapon while also reducing scatter. Integrated mechanisms inside the stock allow use of a devastating two-shot burst. This comes at a cost of the gun becoming too unwieldy to holster, worse handling and mobility."
+	icon_state = "xm51_stock"
+	attach_icon = "xm51_stock_a"
+	wield_delay_mod = WIELD_DELAY_FAST
+	hud_offset_mod = 3
+	melee_mod = 10
+
+/obj/item/attachable/stock/xm51/Initialize(mapload, ...)
+	. = ..()
+	select_gamemode_skin(type)
+	//it makes stuff much better when two-handed
+	accuracy_mod = HIT_ACCURACY_MULT_TIER_3
+	recoil_mod = -RECOIL_AMOUNT_TIER_4
+	scatter_mod = -SCATTER_AMOUNT_TIER_8
+	movement_onehanded_acc_penalty_mod = -MOVEMENT_ACCURACY_PENALTY_MULT_TIER_4
+	//and allows for burst-fire
+	burst_mod = BURST_AMOUNT_TIER_2
+	//but it makes stuff much worse when one handed
+	accuracy_unwielded_mod = -HIT_ACCURACY_MULT_TIER_5
+	recoil_unwielded_mod = RECOIL_AMOUNT_TIER_5
+	scatter_unwielded_mod = SCATTER_AMOUNT_TIER_6
+	//and makes you slower
+	aim_speed_mod = CONFIG_GET(number/slowdown_med)
+
+/obj/item/attachable/stock/xm51/select_gamemode_skin(expected_type, list/override_icon_state, list/override_protection)
+	. = ..()
+	var/new_attach_icon
+	switch(SSmapping.configs[GROUND_MAP].camouflage_type)
+		if("snow")
+			attach_icon = new_attach_icon ? new_attach_icon : "s_" + attach_icon
+		if("desert")
+			attach_icon = new_attach_icon ? new_attach_icon : "d_" + attach_icon
+		if("classic")
+			attach_icon = new_attach_icon ? new_attach_icon : "c_" + attach_icon
+
 /obj/item/attachable/stock/mod88
 	name = "\improper Mod 88 burst stock"
 	desc = "Increases the fire rate and burst amount on the Mod 88. Some versions act as a holster for the weapon when un-attached. This is a test item and should not be used in normal gameplay (yet)."