Adds a variable to check for grenade loading, makes frags unloadable.

code/game/objects/items/weapons/grenades/explosive.dm

@@ -40,6 +40,7 @@
 
 	//The radius of the circle used to launch projectiles. Lower values mean less projectiles are used but if set too low gaps may appear in the spread pattern
 	var/spread_range = 7
+	loadable = null
 
 /obj/item/weapon/grenade/explosive/prime()
 	..()

code/game/objects/items/weapons/grenades/fragmentation.dm

@@ -14,6 +14,7 @@
 	name = "fragmentation grenade"
 	desc = "A military fragmentation grenade, designed to explode in a deadly shower of fragments."
 	icon_state = "frag"
+	loadable = null
 	
 	var/num_fragments = 200  //total number of fragments produced by the grenade
 	var/fragment_damage = 15

code/game/objects/items/weapons/grenades/grenade.dm

@@ -12,6 +12,7 @@
 
 	var/active = 0
 	var/det_time = 50
+	var/loadable = 1
 
 /obj/item/weapon/grenade/proc/clown_check(var/mob/living/user)
 	if((CLUMSY in user.mutations) && prob(50))

code/modules/projectiles/guns/launcher/grenade_launcher.dm

@@ -43,13 +43,16 @@
 			user << "\A [chambered] is chambered."
 
 /obj/item/weapon/gun/launcher/grenade/proc/load(obj/item/weapon/grenade/G, mob/user)
-	if(grenades.len >= max_grenades)
-		user << "<span class='warning'>[src] is full.</span>"
+	if(G.loadable)
+		if(grenades.len >= max_grenades)
+			user << "<span class='warning'>[src] is full.</span>"
+			return
+		user.remove_from_mob(G)
+		G.loc = src
+		grenades.Insert(1, G) //add to the head of the list, so that it is loaded on the next pump
+		user.visible_message("[user] inserts \a [G] into [src].", "<span class='notice'>You insert \a [G] into [src].</span>")
 		return
-	user.remove_from_mob(G)
-	G.loc = src
-	grenades.Insert(1, G) //add to the head of the list, so that it is loaded on the next pump
-	user.visible_message("[user] inserts \a [G] into [src].", "<span class='notice'>You insert \a [G] into [src].</span>")
+	user << "<span class='warning'>[G] doesn't seem to fit in the [src]!</span>"
 
 /obj/item/weapon/gun/launcher/grenade/proc/unload(mob/user)
 	if(grenades.len)
@@ -99,13 +102,16 @@
 
 //load and unload directly into chambered
 /obj/item/weapon/gun/launcher/grenade/underslung/load(obj/item/weapon/grenade/G, mob/user)
-	if(chambered)
-		user << "<span class='warning'>[src] is already loaded.</span>"
+	if(G.loadable)
+		if(chambered)
+			user << "<span class='warning'>[src] is already loaded.</span>"
+			return
+		user.remove_from_mob(G)
+		G.loc = src
+		chambered = G
+		user.visible_message("[user] load \a [G] into [src].", "<span class='notice'>You load \a [G] into [src].</span>")
 		return
-	user.remove_from_mob(G)
-	G.loc = src
-	chambered = G
-	user.visible_message("[user] load \a [G] into [src].", "<span class='notice'>You load \a [G] into [src].</span>")
+	user << "<span class='warning'>[G] doesn't seem to fit in the [src]!</span>"
 
 /obj/item/weapon/gun/launcher/grenade/underslung/unload(mob/user)
 	if(chambered)

html/changelogs/Datraen-GrenadeRestriction.yml

@@ -0,0 +1,6 @@
+author: Datraen
+
+delete-after: True
+
+changes: 
+  - tweak: "Fragmentation grenades are no longer launchable."