diff --git a/server/gameserver/bullet.cc b/server/gameserver/bullet.cc
index 2b059e94..b12939ae 100644
--- a/server/gameserver/bullet.cc
+++ b/server/gameserver/bullet.cc
@@ -142,6 +142,13 @@ void Bullet::OnHit(std::set<Entity*>& objects)
                     if (!room->BulletCanReach(born_pos.ToGlmVec3(), target->GetPos().ToGlmVec3())) {
                         eat = true;
                     }
+                    if (gun_meta->id() == 30905 && eat && sender.Get()) {
+                        glm::vec3 new_born_pos = born_pos.ToGlmVec3();
+                        new_born_pos.y = target->GetPos().GetY();
+                        if (room->BulletCanReach(new_born_pos, target->GetPos().ToGlmVec3())) {
+                            eat = false;
+                        }
+                    }
                     if (sender.Get() && sender.Get()->IsPlayer()) {
 #ifdef MYDEBUG
                         a8::XPrintf("eat %d xxxxxxxxxxxxxxxxxxxxxxxx\n", {eat});
@@ -933,6 +940,9 @@ void Bullet::GetHitCreatures(BulletCheckResult& result)
                          }
                      } else {
                          result.objects.insert(c);
+#ifdef MYDEBUG1
+                         a8::XPrintf("GetHitCreatures gun_id:%d\n", {gun_meta->id()});
+#endif
                          if (gun_meta->ispenetrate()) {
                              ++result.c_hit_num;
                              hit_objects_.insert(c->GetUniId());
@@ -1027,6 +1037,9 @@ float Bullet::GetHitRadius()
             hit_radius = GetExplosionRange();
         }
     }
+    if (gun_meta->id() == 30905) {
+        hit_radius = 20;
+    }
     return hit_radius;
 }
 
diff --git a/server/gameserver/collision.cc b/server/gameserver/collision.cc
index 52b2a03d..87504526 100644
--- a/server/gameserver/collision.cc
+++ b/server/gameserver/collision.cc
@@ -14,7 +14,7 @@
 #include "mt/MapThing.h"
 #include "mt/Hero.h"
 
-static const float GUN_HEIGHT = 10.0f;
+static const float GUN_HEIGHT = 20.0f;
 
 bool Collision::CheckBullet(IBullet* bullet, Creature* c)
 {