cylinder not clicking when pulled back :(

[badas]

just got a new trigger mechanism that is supposadly maruzen.... yet it looks different to my old trigger mechs that are also supposed to be maruzen...

anyways, the insides of the new trigger mech looks like this:



My issue is, that when i pull the cylinder back, its not clicking so when i push the cylinder back into normal place, i pull the trigger and nothing happens....

Whats the issue please and how do i resolve this?

ty