Action mechanism and Slide action

Action mechanism noun - The operating part that transmits power to a mechanism.

Slide action and action mechanism are semantically related. In some cases you can replace phrase "Slide action" with "Action mechanism", this phrases are similar.

Slide action noun - Action mechanism in a modern rifle or shotgun; a back and forward motion of a sliding lever ejects the empty shell case and cocks the firearm and loads a new round.

Action mechanism and slide action are semantically related. You can use "Action mechanism" instead a noun phrase "Slide action".