I've got a different case, it's a Pelican 1750 but I had the foam inserts made in a two layer set up. This works really well for Blaser type break downs. Pictured below with my 12G Beretta with 28" barrels. You could have a setup like this in a much shorter case if you were to pack only one firearm. I'm guessing in iM3100 you could pack 3 or 4 sets of barrels and scopes. I've flow with this set up multiple times and can confirm it survives air travel type handling.
