I was wondering if anyone can help me out with a question, I recently purchased a Gevarm E1 take down, not much info out there but I did watch a couple of vids on youtube how to take it a part. Also how to reverse the spring for either regular or high velocity 22. My question is on the youtube vids it never showed this part that is at the back of receiver. Can anyone help me out as to what is the purpose of this and name of it.
Thanks

Thanks

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