For a rattler, I would look at the following:
DA Sandman K
Rugged Micro 30
Silencerco Omega 9K
The Micro 30 will be quietest I would bet. OMG9k shortest. The Sandman K will be in the middle and would probably be my choice. It has great at the ear numbers for a short can.
With all the little cans, you will be giving up some sound. But for a package that small, and being 300BLK it will be pretty sweet.