One of the most common ARHK questions is will it work with SEF or what housings are supported. This is what ARHK looks like in a SEF Housing without the SEF style selectors that will be a option eventually also.
Full gas with a Sandman X is about 1100RPM, J Bennett Designs' Omega gas valve takes it down to ~880RPM. Doesn't make it cheaper to shoot, but ya know.