diff --git a/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala b/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala
index 8855bb51..cd45fa0e 100644
--- a/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala
+++ b/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala
@@ -519,7 +519,7 @@ object GamePacketOpcode extends Enumeration {
     case 0xa7 => noDecoder(GenericActionMessage)
     // 0xa8
     case 0xa8 => game.ContinentalLockUpdateMessage.decode
-    case 0xa9 => noDecoder(AvatarGrenadeStateMessage)
+    case 0xa9 => game.AvatarGrenadeStateMessage.decode
     case 0xaa => noDecoder(UnknownMessage170)
     case 0xab => noDecoder(UnknownMessage171)
     case 0xac => noDecoder(ReleaseAvatarRequestMessage)
diff --git a/common/src/main/scala/net/psforever/packet/game/AvatarGrenadeStateMessage.scala b/common/src/main/scala/net/psforever/packet/game/AvatarGrenadeStateMessage.scala
new file mode 100644
index 00000000..08e9e27d
--- /dev/null
+++ b/common/src/main/scala/net/psforever/packet/game/AvatarGrenadeStateMessage.scala
@@ -0,0 +1,57 @@
+// Copyright (c) 2016 PSForever.net to present
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PacketHelpers, PlanetSideGamePacket}
+import scodec.Codec
+import scodec.codecs._
+
+/**
+  * An `Enumeration` of the kinds of states applicable to the grenade animation.
+  */
+object GrenadeState extends Enumeration {
+  type Type = Value
+  val UNK0,
+  PRIMED, //avatars and other depicted player characters
+  THROWN //avatars only
+  = Value
+
+  implicit val codec = PacketHelpers.createEnumerationCodec(this, uint8L)
+}
+
+/**
+  * Report the state of the grenade throw animation for this player.
+  * The default state is "held at side," though the client's avatar never has to announce this.<br>
+  * <br>
+  * The throwing animation has a minor timing glitch.
+  * Causing another player to raise his arm will always result in that arm being lowered a few seconds later.
+  * This is as opposed to the client's avatar, who can seem to hold a grenade in the "prepare to throw" state indefinitely.
+  * If the avatar looks away from a player whose grenade arm is up ("prepare to throw"), however, when they look back at the player
+  * his grenade arm will occasionally have been lowered ("held at side") again before it would normally be lowered.<br>
+  * <br>
+  * A client will dispatch state '1' and state '2' for the avatar's actions.
+  * A client will only react temporarily for another character other than the avatar when the given a state '1'.
+  * If that internal state is not changed, however, that other character will not respond to any subsequent '1' state.
+  * (This may also be a glitch.)<br>
+  * <br>
+  * States:<br>
+  * `
+  * 1 - prepare to throw (grenade held back over shoulder)<br>
+  * 2 - throwing (grenade released overhand and then reset) (avatar only)<br>
+  * `
+  * @param player_guid the player
+  * @param state the animation state
+  */
+final case class AvatarGrenadeStateMessage(player_guid : PlanetSideGUID,
+                                           state : GrenadeState.Value)
+  extends PlanetSideGamePacket {
+  type Packet = AvatarGrenadeStateMessage
+  def opcode = GamePacketOpcode.AvatarGrenadeStateMessage
+  def encode = AvatarGrenadeStateMessage.encode(this)
+}
+
+object AvatarGrenadeStateMessage extends Marshallable[AvatarGrenadeStateMessage] {
+  implicit val codec : Codec[AvatarGrenadeStateMessage] = (
+    ("player_guid" | PlanetSideGUID.codec) ::
+      ("state" | GrenadeState.codec)
+    ).as[AvatarGrenadeStateMessage]
+}
diff --git a/common/src/test/scala/GamePacketTest.scala b/common/src/test/scala/GamePacketTest.scala
index c5d847da..ad5c5017 100644
--- a/common/src/test/scala/GamePacketTest.scala
+++ b/common/src/test/scala/GamePacketTest.scala
@@ -1398,6 +1398,27 @@ class GamePacketTest extends Specification {
       }
     }
 
+    "AvatarGrenadeStateMessage" should {
+      val string = hex"A9 DA11 01"
+
+      "decode" in {
+        PacketCoding.DecodePacket(string).require match {
+          case AvatarGrenadeStateMessage(player_guid, state) =>
+            player_guid mustEqual PlanetSideGUID(4570)
+            state mustEqual GrenadeState.PRIMED
+          case default =>
+            ko
+        }
+      }
+
+      "encode" in {
+        val msg = AvatarGrenadeStateMessage(PlanetSideGUID(4570), GrenadeState.PRIMED)
+        val pkt = PacketCoding.EncodePacket(msg).require.toByteVector
+
+        pkt mustEqual string
+      }
+    }
+
     "BroadcastWarpgateUpdateMessage" should {
       val string = hex"D9 0D 00 01 00 20"
 
diff --git a/pslogin/src/main/scala/WorldSessionActor.scala b/pslogin/src/main/scala/WorldSessionActor.scala
index fbce7b3e..23f5f6d9 100644
--- a/pslogin/src/main/scala/WorldSessionActor.scala
+++ b/pslogin/src/main/scala/WorldSessionActor.scala
@@ -329,6 +329,9 @@ class WorldSessionActor extends Actor with MDCContextAware {
     case msg @ MountVehicleMsg(player_guid, vehicle_guid, unk) =>
       log.info("MounVehicleMsg: "+msg)
 
+    case msg @ AvatarGrenadeStateMessage(player_guid, state) =>
+      log.info("AvatarGrenadeStateMessage: " + msg)
+
     case default => log.debug(s"Unhandled GamePacket ${pkt}")
   }