Benjamin Akela brass insert?

What is this brass insert for? And/or what thread is it?

Thanks all!

Txplkr
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The picatinny rail should of came with the gun if bought new. Did you buy it used ? as I may have a extra one around here if you need one for free. Just let me know Darel

Good info. Thank you! That is incredibly generous @kayaker. I bought used. Let me go double check my box for this one. It is possible I have it tucked away in there.
 
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