added muzzle flash

Assets/Resources/Prefabs/M16A4.prefab

@@ -2289,6 +2289,7 @@ Transform:
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@@ -2317,7 +2318,94 @@ MonoBehaviour:
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-  muzzleFlash: {fileID: 0}
+  muzzleFlash: {fileID: 8468216518845151464}
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