diff --git a/build.gradle b/build.gradle
index c5f1401aa9..3dd0059419 100644
--- a/build.gradle
+++ b/build.gradle
@@ -27,7 +27,7 @@ allprojects {
         gdxVersion = '1.9.8'
         roboVMVersion = '2.3.0'
         aiVersion = '1.8.1'
-        uCoreVersion = '2a575ccc77'
+        uCoreVersion = 'a19e59c800'
 
         getVersionString = {
             String buildVersion = getBuildVersion()
diff --git a/core/src/io/anuke/mindustry/entities/effect/ItemTransfer.java b/core/src/io/anuke/mindustry/entities/effect/ItemTransfer.java
index 8111257051..77be28ed13 100644
--- a/core/src/io/anuke/mindustry/entities/effect/ItemTransfer.java
+++ b/core/src/io/anuke/mindustry/entities/effect/ItemTransfer.java
@@ -15,13 +15,13 @@ import io.anuke.ucore.entities.EntityGroup;
 import io.anuke.ucore.entities.impl.TimedEntity;
 import io.anuke.ucore.entities.trait.DrawTrait;
 import io.anuke.ucore.entities.trait.PosTrait;
-import io.anuke.ucore.function.Callable;
 import io.anuke.ucore.graphics.Draw;
 import io.anuke.ucore.graphics.Fill;
 import io.anuke.ucore.graphics.Lines;
 import io.anuke.ucore.util.Mathf;
 
 import static io.anuke.mindustry.Vars.effectGroup;
+import static io.anuke.mindustry.Vars.threads;
 
 public class ItemTransfer extends TimedEntity implements DrawTrait{
     private Vector2 from = new Vector2();
@@ -30,7 +30,7 @@ public class ItemTransfer extends TimedEntity implements DrawTrait{
     private Item item;
     private float seed;
     private PosTrait to;
-    private Callable done;
+    private Runnable done;
 
     @Remote(in = In.entities, called = Loc.server, unreliable = true)
     public static void transferAmmo(Item item, float x, float y, Unit to){
@@ -60,7 +60,7 @@ public class ItemTransfer extends TimedEntity implements DrawTrait{
         tile.entity.items.addItem(item, amount);
     }
 
-    public static void create(Item item, float fromx, float fromy, PosTrait to, Callable done){
+    public static void create(Item item, float fromx, float fromy, PosTrait to, Runnable done){
         ItemTransfer tr = Pools.obtain(ItemTransfer.class);
         tr.item = item;
         tr.from.set(fromx, fromy);
@@ -90,7 +90,9 @@ public class ItemTransfer extends TimedEntity implements DrawTrait{
 
     @Override
     public void removed() {
-        done.run();
+        if(done != null){
+            threads.run(done);
+        }
         Pools.free(this);
     }
 
diff --git a/core/src/io/anuke/mindustry/graphics/BlockRenderer.java b/core/src/io/anuke/mindustry/graphics/BlockRenderer.java
index 9f304fc081..186537dd3e 100644
--- a/core/src/io/anuke/mindustry/graphics/BlockRenderer.java
+++ b/core/src/io/anuke/mindustry/graphics/BlockRenderer.java
@@ -72,7 +72,7 @@ public class BlockRenderer{
 					
 					if(!expanded && block != Blocks.air && world.isAccessible(worldx, worldy)){
 						synchronized (Tile.tileSetLock) {
-							block.drawShadow(tile);
+							tile.block().drawShadow(tile);
 						}
 					}
 					
@@ -125,7 +125,6 @@ public class BlockRenderer{
 			}
 			
 			BlockRequest req = requests.get(iterateidx);
-			Block block = req.tile.block();
 
 			if(req.layer != lastLayer){
 				if(lastLayer != null) layerEnds(lastLayer);
@@ -133,6 +132,8 @@ public class BlockRenderer{
 			}
 
 			synchronized (Tile.tileSetLock) {
+				Block block = req.tile.block();
+
 				if (req.layer == Layer.block) {
 					block.draw(req.tile);
 				} else if (req.layer == block.layer) {
@@ -157,12 +158,15 @@ public class BlockRenderer{
 
 			BlockRequest req = requests.get(index);
 			if(req.tile.getTeam() != team) continue;
-			Block block = req.tile.block();
 
-			if(req.layer == block.layer){
-				block.drawLayer(req.tile);
-			}else if(req.layer == block.layer2){
-				block.drawLayer2(req.tile);
+			synchronized (Tile.tileSetLock) {
+				Block block = req.tile.block();
+
+				if (req.layer == block.layer) {
+					block.drawLayer(req.tile);
+				} else if (req.layer == block.layer2) {
+					block.drawLayer2(req.tile);
+				}
 			}
 		}
 	}
diff --git a/core/src/io/anuke/mindustry/world/blocks/defense/turrets/ArtilleryTurret.java b/core/src/io/anuke/mindustry/world/blocks/defense/turrets/ArtilleryTurret.java
index f7047618cc..8bdb849950 100644
--- a/core/src/io/anuke/mindustry/world/blocks/defense/turrets/ArtilleryTurret.java
+++ b/core/src/io/anuke/mindustry/world/blocks/defense/turrets/ArtilleryTurret.java
@@ -24,7 +24,6 @@ public class ArtilleryTurret extends ItemTurret {
         entity.heat = 1f;
 
         AmmoType type = peekAmmo(tile);
-        useAmmo(tile);
 
         tr.trns(entity.rotation, size * tilesize / 2);
 
@@ -37,5 +36,6 @@ public class ArtilleryTurret extends ItemTurret {
                 entity.rotation + Mathf.range(inaccuracy + type.inaccuracy), dst/maxTraveled);
 
         effects(tile);
+        useAmmo(tile);
     }
 }