If the measurements are correct, the skirtless cones at MutedMachineWorks would be ideal blast baffles in stainless. They also sell spacers for the skirtless cones, but its not often everything you want is in stock....just get what you want when you can and get on the email list.
Maverick tubes are thick for the first 2 inches or so (blast chamber).
Maverick tubes are thick for the first 2 inches or so (blast chamber).