[undeRGRound]

AFAIK, there aren't any angled front grips with storage. But never say never, right?
There are some straight ones though.

Ummm what is that Israeli outfit?
They had one with storage. I may
still have one, too. FAB DEFENSE!!!

Yeah I believe they had an afg with storage.

 

[undeRGRound]

Yep, and I have one of these, afaik...
New is $42 plus shipping maybe...

Same outfit also has a 7 position folding grip, much like Hi-Point's, with a compartment and also a fixed slightly angled "forward pistol grip" with storage. It's out there, but $$.cc Lotta Dough!