Bomb launching Sounds / Overwatch Clip Re-design

Hi everyone, been working on this clip recently from one of the overwatch shorts, its still a work in progress.

I wondered if anyone had any advice for the robot firing bombs around 6 seconds in? i have done lots of revisions of this but cant seem to get anything sounding right, my aim is to get something weighty and menacing to match with the rest of the robot sounds, but when i try this it does not feel transient enough.

If anyone has any other feedback on this clip so far that would also be appreciated.