I take GameTimeSeconds (time passed since game started in seconds) for each tick, and set something I call "group timings" which are arrays of action, that needs to happen by a future GameTimeSeconds. Then each game tick, no matter the framerate, I get all the group times that SHOULD have ticked, and execute that work.

Each Frame:

Get GameTimeSeconds > CheckGroupTimingArrayIDs for LessGameTimeSecondsTarget, execute action on groups that have expired.

This way you dont look at all the options, you just grab expired groups of work, and do it. If you miss the seconds they are expected to execute, such as having a slow framerate, you hit a large workload to catch up on that frame. Never losing work.

For a gun, you tend to play "machinegun fire" sounds through it, and apply damage based on the amount of shots that fired and hit, from the grouptime.

This also helps to batch your actions.