Hi Airsource2250XT,
I live in Belgium and own an unregulated version of the Walther Reign (.22). I can add that my Reign reaches peak velocity when the manometer reads around 150Bar (289M/S - 946 FPS on exact jumbo diabolo 15,89 gr). And I have only around 12 shots before velocity drops again.
I've asked the German Umarex service of the possibility of an aftermarket regulator. At the time of purchase there was little known if the version had a regulator installed. I had no response yet from Umarex..
Hopefully someone on this forum perhaps knows a way for me to get a regulator for this Reign, I would not mind a drop in velocity or power, just want a flatter curve.
Happy new year , BTW!