Moved can_trigger_gun to item/weapon parent

code/game/objects/items/weapons/flamethrower.dm

@@ -26,6 +26,7 @@
 	var/create_full = FALSE
 	var/create_with_tank = FALSE
 	var/igniter_type = /obj/item/device/assembly/igniter
+	trigger_guard = TRIGGER_GUARD_NORMAL
 
 /obj/item/weapon/flamethrower/Destroy()
 	if(weldtool)
@@ -69,12 +70,7 @@
 	if(flag)
 		return // too close
 	if(ishuman(user))
-		var/mob/living/carbon/human/H = user
-		if(H.dna.check_mutation(HULK))
-			to_chat(user, "<span class='warning'>Your meaty finger is much too large for the trigger guard!</span>")
-			return
-		if(NOGUNS in H.dna.species.species_traits)
-			to_chat(user, "<span class='warning'>Your fingers don't fit in the trigger guard!</span>")
+		if(!can_trigger_gun(user))
 			return
 	if(user && user.get_active_held_item() == src) // Make sure our user is still holding us
 		var/turf/target_turf = get_turf(target)

code/game/objects/items/weapons/pneumaticCannon.dm

@@ -26,6 +26,7 @@
 	var/fire_mode = PCANNON_FIREALL
 	var/automatic = FALSE
 	var/clumsyCheck = TRUE
+	trigger_guard = TRIGGER_GUARD_NORMAL
 
 /obj/item/weapon/pneumatic_cannon/CanItemAutoclick()
 	return automatic
@@ -108,11 +109,7 @@
 	if(!istype(user) && !target)
 		return
 	var/discharge = 0
-	if(user.dna.check_mutation(HULK))
-		to_chat(user, "<span class='warning'>Your meaty finger is much too large for the trigger guard!</span>")
-		return
-	if(NOGUNS in user.dna.species.species_traits)
-		to_chat(user, "<span class='warning'>Your fingers don't fit in the trigger guard!</span>")
+	if(!can_trigger_gun(user))
 		return
 	if(!loadedItems || !loadedWeightClass)
 		to_chat(user, "<span class='warning'>\The [src] has nothing loaded.</span>")

code/game/objects/items/weapons/weaponry.dm

@@ -1,4 +1,5 @@
 /obj/item/weapon
+	var/trigger_guard = TRIGGER_GUARD_NONE
 
 /obj/item/weapon/banhammer
 	desc = "A banhammer"
@@ -584,3 +585,8 @@
 	throwforce = 0
 	flags = DROPDEL | ABSTRACT
 	attack_verb = list("bopped")
+
+/obj/item/weapon/proc/can_trigger_gun(mob/living/user)
+	if(!user.can_use_guns(src))
+		return FALSE
+	return TRUE