Quoting Anson Mansfield
As that language has meaning only as long as it is applied to stuff, whatever you apply a name to becomes that thing (like charging handle), as you are redefining not the object but the term. However, the conventional term would probably be "cocking lever" (even if it doesn't employ a lever at all in the operation). That or "bolt". Very good anyway.
Yep... I'm from Finland by the way and I haven't translated lot of gun terms... :)