Originally Posted by StealthRT

Just FYI on the subject, but don't listen to anyone who says you have to have HPA for The One kit. A/S co2 will work 100% perfectly fine on it with no trouble what so ever. The stock reg isn't AS great with co2 as some good ones like the Stabilizer or Torpedo, but it does the job...It also will no hurt the noid long as the co2 a/s tube is install and working correctly. I have over 7 months of use and who knows how many shoots on my The One without a single bit of damage from co2. It is absolutly not required to have HPA...