upp machinegunner tweaks (cmss13-devs#198)

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

@@ -1888,6 +1888,9 @@
 		/obj/item/ammo_magazine/pkp,
 	)
 	has_gamemode_skin = FALSE
+	item_state_slots = list(
+		WEAR_L_HAND = "upp_belt",
+		WEAR_R_HAND = "upp_belt")
 
 /obj/item/storage/belt/gun/mortarbelt
 	name="\improper M276 pattern mortar operator belt"

code/modules/clothing/suits/marine_armor.dm

@@ -417,9 +417,6 @@
 	. = ..()
 	if(SSmapping.configs[GROUND_MAP].environment_traits[MAP_COLD] && name == "M56 combat harness")
 		name = "M56 snow combat harness"
-	else
-		name = "M56 combat harness"
-	//select_gamemode_skin(type)
 
 /obj/item/clothing/suit/storage/marine/smartgunner/mob_can_equip(mob/equipping_mob, slot, disable_warning = FALSE)
 	. = ..()
@@ -454,6 +451,44 @@
 /obj/item/clothing/suit/storage/marine/smartgunner/standard
 	flags_atom = NO_SNOW_TYPE
 
+/obj/item/clothing/suit/storage/marine/smartgunner/upp
+	name = "\improper UH7-I heavy plated harness"
+	desc = "An experimental set of heavy armor with additional harnesses designed to support QYJ-72-I smartmachinegun. Heavy plates along with harnesses make wearing backpacks extremely uncomfortable and borderline impossible."
+	icon_state = "upp_armor_heavy"
+	storage_slots = 1
+	slowdown = SLOWDOWN_ARMOR_HEAVY
+	flags_atom = NO_SNOW_TYPE|NO_NAME_OVERRIDE
+	flags_inventory = BLOCKSHARPOBJ|SMARTGUN_HARNESS|BLOCK_KNOCKDOWN
+	armor_melee = CLOTHING_ARMOR_MEDIUMHIGH
+	armor_bullet = CLOTHING_ARMOR_HIGHPLUS
+	armor_laser = CLOTHING_ARMOR_MEDIUMLOW
+	armor_energy = CLOTHING_ARMOR_MEDIUM
+	armor_bomb = CLOTHING_ARMOR_HIGH
+	armor_bio = CLOTHING_ARMOR_MEDIUM
+	armor_rad = CLOTHING_ARMOR_MEDIUMLOW
+	armor_internaldamage = CLOTHING_ARMOR_HIGHPLUS
+	uniform_restricted = list(/obj/item/clothing/under/marine/veteran/UPP, /obj/item/clothing/under/marine/veteran/UPP/medic, /obj/item/clothing/under/marine/veteran/UPP/engi)
+	allowed = list(
+		/obj/item/tank/emergency_oxygen,
+		/obj/item/device/flashlight,
+		/obj/item/ammo_magazine,
+		/obj/item/explosive/mine,
+		/obj/item/attachable/bayonet,
+		/obj/item/weapon/gun/pkp,
+		/obj/item/storage/backpack/general_belt,
+		/obj/item/device/motiondetector,
+		/obj/item/device/walkman,
+	)
+
+
+/obj/item/clothing/suit/storage/marine/smartgunner/upp/Initialize()
+	. = ..()
+	pockets.bypass_w_limit = list(
+		/obj/item/ammo_magazine/minigun,
+		/obj/item/ammo_magazine/pkp,
+		)
+
+
 /obj/item/clothing/suit/storage/marine/leader
 	name = "\improper B12 pattern marine armor"
 	desc = "Semi-experimental body armor system similar to M3, incorporating primarily carbon fiber instead of boron carbide. \nDesigned in a lovely olive green, slightly improved protection against blunt impact and biological hazards."

code/modules/clothing/under/marine_uniform.dm

@@ -527,7 +527,7 @@
 	min_cold_protection_temperature = ICE_PLANET_MIN_COLD_PROT
 	has_sensor = UNIFORM_HAS_SENSORS
 	sensor_faction = FACTION_UPP
-	suit_restricted = list(/obj/item/clothing/suit/storage/marine/faction/UPP, /obj/item/clothing/suit/gimmick/jason, /obj/item/clothing/suit/storage/snow_suit/soviet, /obj/item/clothing/suit/storage/snow_suit/survivor, /obj/item/clothing/suit/storage/webbing)
+	suit_restricted = list(/obj/item/clothing/suit/storage/marine/faction/UPP, /obj/item/clothing/suit/gimmick/jason, /obj/item/clothing/suit/storage/snow_suit/soviet, /obj/item/clothing/suit/storage/snow_suit/survivor, /obj/item/clothing/suit/storage/webbing, /obj/item/clothing/suit/storage/marine/smartgunner/upp)
 	flags_jumpsuit = UNIFORM_SLEEVE_ROLLABLE
 
 /obj/item/clothing/under/marine/veteran/UPP/boiler

code/modules/projectiles/guns/misc.dm

@@ -272,13 +272,26 @@
 			return FALSE
 	if(!skillcheck(user, SKILL_FIREARMS, SKILL_FIREARMS_TRAINED))
 		to_chat(user, SPAN_WARNING("You don't seem to know how to use [src]..."))
-		return 0
+		return FALSE
 
 /obj/item/weapon/gun/pkp/iff
 	name = "\improper QYJ-72-I General Purpose Machine Gun"
 	desc = "The QYJ-72-I is an experimental variant of common UPP GPMG featuring IFF capabilities which were developed by reverse-engineering USCM smartweapons. Aside from that, not much has been done to this machinegun: it's still heavy, overheats rather quickly and is able to lay down range unprecedented amounts of lead. \n<b>Alt-click it to open the feed cover and allow for reloading.</b>"
 	actions_types = list(/datum/action/item_action/toggle_iff_pkp)
+	aim_slowdown = SLOWDOWN_ADS_SPECIALIST
 	var/iff_enabled = TRUE
+	var/requires_harness = TRUE
+
+/obj/item/weapon/gun/pkp/iff/able_to_fire(mob/living/user)
+	. = ..()
+	if(.)
+		if(!ishuman(user))
+			return FALSE
+		var/mob/living/carbon/human/H = user
+		if(requires_harness)
+			if(!H.wear_suit || !(H.wear_suit.flags_inventory & SMARTGUN_HARNESS))
+				balloon_alert(user, "harness required")
+				return FALSE
 
 /obj/item/weapon/gun/pkp/iff/set_bullet_traits()
 	LAZYADD(traits_to_give, list(