New to AKs...What is this?

[sadmin]

It came with some E.German bakelite pack I bought the other day.
https://www.amazon.com/clouddrive/share?s=9wr_HSx2RYIuN3jNoU7Qu8

[Jippo]

That is Russian style blank firing adapter. It allows the weapon to cycle when using blanks. Do not use it with any live ammunition. If you do the rifle can be damaged and you have a good chance to injure yourself.

[sadmin]

Understood- thank you!