RAP aftermarket parts?

has anyone heard if someone has come out with a aftermarket barrel for the RAP? maybe a extended or a ported barrel?

The popularity isn't anywhere near high enough for someone to tool up production of aftermarket barrels.

I don't see it happening unless the RAP starts getting alot of competition use. In any event, why would a manufacturer put money and R&D into developing aftermarket goodies when it is highly likely the RAP will be replaced with something else in a decade or so?