A few years ago, when i've bought my HW100 (in 2006). I've sent an e-mail to Weihrauch asking them if the HW100 was regulated.
The answer that i've received stated that the HW100 is regulated. I also was informed that the hw100 regulator has a different design that is not conventional.
I remenber that a few weeks later someone posted a series of X-ray pictures of the HW100 action where the regulator was cleary seen.