Pub Quiz. What the Chuff Is This Part?

[Jimbodini42]

Hi

Took JG MP5K apart. Been a struggle. 
 

I have these two small/tiny components left over... not a clue where they go. 
 

Prize (not really) for anyone who guesses right..! 

View attachment 56106

View attachment 56107

View attachment 56108

 

[Iceni]

Selector detent. It goes inside the selector lever.