primed grenades must not be disassembable easy

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

@@ -52,7 +52,7 @@
 			if(istype(det.a_left,det.a_right.type) || (!isigniter(det.a_left) && !isigniter(det.a_right)))
 				user << "\red Assembly must contain one igniter."
 				return
-			if(!det.secured)	
+			if(!det.secured)
 				user << "\red Assembly must be secured with screwdriver."
 				return
 			path = 1
@@ -81,12 +81,17 @@
 					icon_state = initial(icon_state) +"_locked"
 					stage = 2
 			else if(stage == 2)
-				user << "\blue You unlock the assembly."
-				playsound(src.loc, 'sound/items/Screwdriver.ogg', 25, -3)
-				name = "unsecured grenade with [beakers.len] containers[detonator?" and detonator":""]"
-				icon_state = initial(icon_state) + (detonator?"_ass":"")
-				stage = 1
-				active = 0
+				if(active && prob(95))
+					user << "\red You trigger the assembly!"
+					prime()
+					return
+				else
+					user << "\blue You unlock the assembly."
+					playsound(src.loc, 'sound/items/Screwdriver.ogg', 25, -3)
+					name = "unsecured grenade with [beakers.len] containers[detonator?" and detonator":""]"
+					icon_state = initial(icon_state) + (detonator?"_ass":"")
+					stage = 1
+					active = 0
 		else if(is_type_in_list(W, allowed_containers) && (!stage || stage==1) && path != 2)
 			path = 1
 			if(beakers.len == 2)

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

@@ -20,12 +20,9 @@
 		log_admin("ATTACK: [user] ([user.ckey]) clumsily primed \a [src]")
 		message_admins("ATTACK: [user] ([user.ckey]) clumsily primed \a [src]")
 
-		active = 1
-		icon_state = initial(icon_state) + "_active"
-		playsound(loc, 'sound/weapons/armbomb.ogg', 75, 1, -3)
+		activate()
+		add_fingerprint(user)
 		spawn(5)
-			if(user)
-				user.drop_item()
 			prime()
 		return 0
 	return 1
@@ -67,20 +64,27 @@
 			log_admin("ATTACK: [user] ([user.ckey]) primed \a [src].")
 			message_admins("ATTACK: [user] ([user.ckey]) primed \a [src].")
 
-			active = 1
-			icon_state = initial(icon_state) + "_active"
+			activate()
 			add_fingerprint(user)
 			if(iscarbon(user))
 				var/mob/living/carbon/C = user
 				C.throw_mode_on()
-			spawn(det_time)
-				if(user)
-					user.drop_item()
-				prime()
-				return
 	return
 
 
+/obj/item/weapon/grenade/proc/activate()
+	if(active)
+		return
+
+	icon_state = initial(icon_state) + "_active"
+	active = 1
+	playsound(loc, 'sound/weapons/armbomb.ogg', 75, 1, -3)
+
+	spawn(det_time)
+		prime()
+		return
+
+
 /obj/item/weapon/grenade/proc/prime()
 //	playsound(loc, 'sound/items/Welder2.ogg', 25, 1)
 	var/turf/T = get_turf(src)