The regulator is heated because the 100m shoots are in- / outdoors where there is no heating, so very cold in jan/feb/mar.
The HW100 regulator performs very bad under 10 deg C, so that is why I built in a heating element, powered by an external battery to tackle that issue. It works very well, clearly better groups under 10 degr C.
Ah! Makes sense. Thought it was some mysterious secret accuracy tip
Wouldn't know what sub-10 feels like, not here
**WANTED**: WEBLEY PATRIOT MUZZLE END; Any Diana/Original mod.50 parts, especially OPEN SIGHTS