Re: 50 Rd Hopper on a VS2
Depends on if an ASA will screw into the bottom of the grip frame. Mine has a Euro-style grip and that's out of the question. Some you can, though.
I don't see why there'd be an issue with HPA if the marker'll accept CO2. CO2 is horrible, and if it can use that **** and come up kicking and fighting, then HPA can only help it.