diff --git a/core/src/mindustry/content/TechTree.java b/core/src/mindustry/content/TechTree.java
index d55eb68623..789919a16b 100644
--- a/core/src/mindustry/content/TechTree.java
+++ b/core/src/mindustry/content/TechTree.java
@@ -343,6 +343,7 @@ public class TechTree implements ContentList{
     public static class TechNode{
         static TechNode context;
 
+        public TechNode parent;
         public final Block block;
         public final ItemStack[] requirements;
         public final Array<TechNode> children = new Array<>();
@@ -352,6 +353,7 @@ public class TechTree implements ContentList{
                 ccontext.children.add(this);
             }
 
+            this.parent = ccontext;
             this.block = block;
             this.requirements = requirements;
 
diff --git a/core/src/mindustry/entities/def/WeaponsComp.java b/core/src/mindustry/entities/def/WeaponsComp.java
index ae0b13e9ef..ccbb4edfea 100644
--- a/core/src/mindustry/entities/def/WeaponsComp.java
+++ b/core/src/mindustry/entities/def/WeaponsComp.java
@@ -78,7 +78,6 @@ abstract class WeaponsComp implements Teamc, Posc, Rotc{
                 float rotation = this.rotation - 90;
 
                 //shoot if applicable
-                //TODO only shoot if angle is reached, don't shoot inaccurately
                 if(mount.reload <= 0.0001f && Angles.within(mount.rotation, mount.targetRotation, 1.5f)){
                     for(int i : (weapon.mirror && !weapon.alternate ? Mathf.signs : Mathf.one)){
                         i *= Mathf.sign(weapon.flipped) * Mathf.sign(mount.side);
@@ -91,7 +90,7 @@ abstract class WeaponsComp implements Teamc, Posc, Rotc{
                             shootY = mountY + Angles.trnsy(weaponRotation, weapon.shootX * i, weapon.shootY);
                         float shootAngle = weapon.rotate ? weaponRotation + 90 : Angles.angle(shootX, shootY, mount.aimX, mount.aimY) + (this.rotation - angleTo(mount.aimX, mount.aimY));
 
-                        shoot(weapon, shootX, shootY, shootAngle);
+                        shoot(weapon, shootX, shootY, shootAngle, -i);
                     }
 
                     mount.side = !mount.side;
@@ -101,7 +100,7 @@ abstract class WeaponsComp implements Teamc, Posc, Rotc{
         }
     }
 
-    private void shoot(Weapon weapon, float x, float y, float rotation){
+    private void shoot(Weapon weapon, float x, float y, float rotation, int side){
         float baseX = this.x, baseY = this.y;
 
         weapon.shootSound.at(x, y, Mathf.random(0.8f, 1.0f));
@@ -129,7 +128,7 @@ abstract class WeaponsComp implements Teamc, Posc, Rotc{
         boolean parentize = ammo.keepVelocity;
 
         Effects.shake(weapon.shake, weapon.shake, x, y);
-        weapon.ejectEffect.at(x, y, rotation);
+        weapon.ejectEffect.at(x, y, rotation * side);
         ammo.shootEffect.at(x + Tmp.v1.x, y + Tmp.v1.y, rotation, parentize ? this : null);
         ammo.smokeEffect.at(x + Tmp.v1.x, y + Tmp.v1.y, rotation, parentize ? this : null);
     }
diff --git a/core/src/mindustry/maps/planet/TestPlanetGenerator.java b/core/src/mindustry/maps/planet/TestPlanetGenerator.java
index de03b97a26..0e307c107b 100644
--- a/core/src/mindustry/maps/planet/TestPlanetGenerator.java
+++ b/core/src/mindustry/maps/planet/TestPlanetGenerator.java
@@ -53,7 +53,6 @@ public class TestPlanetGenerator implements PlanetGenerator{
     @Override
     public void generate(Vec3 position, TileGen tile){
         tile.floor = getBlock(position);
-        tile.overlay = Mathf.chance(0.01) ? Blocks.oreCopper : Blocks.air;
     }
 
     Block getBlock(Vec3 position){
diff --git a/core/src/mindustry/mod/ContentParser.java b/core/src/mindustry/mod/ContentParser.java
index 1b7a179a48..9ab42185c2 100644
--- a/core/src/mindustry/mod/ContentParser.java
+++ b/core/src/mindustry/mod/ContentParser.java
@@ -6,7 +6,7 @@ import arc.audio.*;
 import arc.files.*;
 import arc.func.*;
 import arc.graphics.*;
-import arc.mock.MockSound;
+import arc.mock.*;
 import arc.struct.Array;
 import arc.struct.*;
 import arc.util.ArcAnnotate.*;
@@ -173,9 +173,11 @@ public class ContentParser{
             readBundle(ContentType.block, name, value);
 
             Block block;
+            boolean exists;
 
             if(locate(ContentType.block, name) != null){
                 block = locate(ContentType.block, name);
+                exists = true;
 
                 if(value.has("type")){
                     throw new IllegalArgumentException("When defining properties for an existing block, you must not re-declare its type. The original type will be used. Block: " + name);
@@ -183,6 +185,7 @@ public class ContentParser{
             }else{
                 //TODO generate dynamically instead of doing.. this
                 Class<? extends Block> type;
+                exists = false;
 
                 try{
                     type = resolve(getType(value),
@@ -249,13 +252,17 @@ public class ContentParser{
                 //add research tech node
                 if(research[0] != null){
                     Block parent = find(ContentType.block, research[0]);
-                    TechNode baseNode = TechTree.create(parent, block);
+                    TechNode baseNode = exists && TechTree.all.contains(t -> t.block == block) ? TechTree.all.find(t -> t.block == block) : TechTree.create(parent, block);
                     LoadedMod cur = currentMod;
 
                     postreads.add(() -> {
                         currentContent = block;
                         currentMod = cur;
 
+                        if(baseNode.parent != null){
+                            baseNode.parent.children.remove(baseNode);
+                        }
+
                         TechNode parnode = TechTree.all.find(t -> t.block == parent);
                         if(parnode == null){
                             throw new IllegalArgumentException("Block '" + parent.name + "' isn't in the tech tree, but '" + block.name + "' requires it to be researched.");
@@ -263,7 +270,9 @@ public class ContentParser{
                         if(!parnode.children.contains(baseNode)){
                             parnode.children.add(baseNode);
                         }
+                        baseNode.parent = parnode;
                     });
+
                 }
 
                 //make block visible by default if there are requirements and no visibility set
diff --git a/gradle.properties b/gradle.properties
index ab05152a26..60187da317 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,3 @@
 org.gradle.daemon=true
 org.gradle.jvmargs=-Xms256m -Xmx1024m
-archash=d5eb3f0c3df12ba6f6b20c1c95952bc22d4250b3
+archash=0b2f044e5955ff700650eebecfb3dfcb629d7a8b