Credit to Arken for quick communication.
I first inquired as too any physical, mechanical, or material differences between the US and AUS EP-5 7-35 and received the following reply.
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I then asked for clarification on if the material differences mentioned were between Arken US and Arken AUS scopes or if that statement was in reference to competitor offerings.
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Honestly, not the answer I had expected. After this exchange, I’m having a very difficult time reconciling what has been articulated in this thread.