Innovation does not always have to be the biggest and bad-arse. Sometimes it can be the little things that go a long way. Qualifying for the latter is Griffin Armaments Maritime Receiver Extension for modern sporting rifles. Basically, its a standard extension, but adds more drainage holes to ensure the weapon system stays up and running after being submerged.
Instead of the common 6061, Griffin uses a 7075-T6 forging that is then machined to military specifications and then holes are added.