diff --git a/build.gradle b/build.gradle
index 95f1e4da10..7fe10efa58 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 = ' b6d22d5'
+        uCoreVersion = 'b6d22d5'
 
         getVersionString = {
             String buildVersion = getBuildVersion()
diff --git a/core/src/io/anuke/mindustry/core/NetServer.java b/core/src/io/anuke/mindustry/core/NetServer.java
index 1f0598ea90..e3fb7bd309 100644
--- a/core/src/io/anuke/mindustry/core/NetServer.java
+++ b/core/src/io/anuke/mindustry/core/NetServer.java
@@ -359,12 +359,12 @@ public class NetServer extends Module{
                         }
                     }
 
-                    //write group ID + group sizeif(((SyncTrait)entity).isSyncing())
+                    //write group ID + group size
                     dataStream.writeByte(group.getID());
                     dataStream.writeShort(amount);
 
                     for(Entity entity : group.all()){
-                        if(!((SyncTrait)entity).isSyncing()) continue;;
+                        if(!((SyncTrait)entity).isSyncing()) continue;
 
                         int position = syncStream.position();
                         //write all entities now
diff --git a/core/src/io/anuke/mindustry/entities/Player.java b/core/src/io/anuke/mindustry/entities/Player.java
index 918a350795..7b35b08e8c 100644
--- a/core/src/io/anuke/mindustry/entities/Player.java
+++ b/core/src/io/anuke/mindustry/entities/Player.java
@@ -650,7 +650,7 @@ public class Player extends Unit implements BuilderTrait, CarryTrait {
 	@Override
 	public void write(DataOutput buffer) throws IOException {
 		super.writeSave(buffer, !isLocal);
-		buffer.writeUTF(name);
+		buffer.writeUTF(name); //TODO writing strings is very inefficient
 		buffer.writeBoolean(isAdmin);
 		buffer.writeInt(Color.rgba8888(color));
 		buffer.writeBoolean(dead);
diff --git a/core/src/io/anuke/mindustry/entities/bullet/Bullet.java b/core/src/io/anuke/mindustry/entities/bullet/Bullet.java
index 0121d0b38a..6d4df2f08e 100644
--- a/core/src/io/anuke/mindustry/entities/bullet/Bullet.java
+++ b/core/src/io/anuke/mindustry/entities/bullet/Bullet.java
@@ -74,7 +74,7 @@ public class Bullet extends BulletEntity<BulletType> implements TeamTrait, SyncT
 	public Bullet(){}
 
 	public boolean collidesTiles(){
-		return true; //TODO make artillery and such not do this
+		return type.collidesTiles; //TODO make artillery and such not do this
 	}
 
 	@Override
diff --git a/core/src/io/anuke/mindustry/entities/bullet/BulletType.java b/core/src/io/anuke/mindustry/entities/bullet/BulletType.java
index ecc0d97bb4..c505108d33 100644
--- a/core/src/io/anuke/mindustry/entities/bullet/BulletType.java
+++ b/core/src/io/anuke/mindustry/entities/bullet/BulletType.java
@@ -25,6 +25,8 @@ public abstract class BulletType extends BaseBulletType<Bullet> implements Conte
 	public float armorPierce = 0f;
 	/**Whether to sync this bullet to clients.*/
 	public boolean syncable;
+	/**Whether this bullet type collides with tiles.*/
+	public boolean collidesTiles;
 
 	public BulletType(float speed, float damage){
 		this.id = lastid ++;
diff --git a/core/src/io/anuke/mindustry/entities/traits/SyncTrait.java b/core/src/io/anuke/mindustry/entities/traits/SyncTrait.java
index 91f74c8640..9df5cd248d 100644
--- a/core/src/io/anuke/mindustry/entities/traits/SyncTrait.java
+++ b/core/src/io/anuke/mindustry/entities/traits/SyncTrait.java
@@ -12,7 +12,7 @@ import static io.anuke.mindustry.Vars.threads;
 
 public interface SyncTrait extends Entity, TypeTrait {
 
-    /**Whether smoothing of entities is enabled; not yet implemented.*/
+    /**Whether smoothing of entities is enabled when using multithreading; not yet implemented.*/
     static boolean isSmoothing(){
         return threads.isEnabled() && threads.getFPS() <= Gdx.graphics.getFramesPerSecond() / 2f;
     }