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I was successful at getting my Zelos tuned. From the factory, the hammer was definitely over sprung. I ordered several different spring from AliExpress and the one that worked the best is a carbon steel (not SS) spring with 1mm wire diameter, 8mm coil OD, and 70mm length. Link below...

I just "rediscovered" the Zelos over sprung problem. Decided to shoot 15.89 JSBs and wanted to tune down to around 900 fps. Dropped reg pressure to about 1800 psi and got speed down to about 925 - 930 fps. Tried to adjust the HS and found that more pre-load consistently dropped the velocity...

You are answering a question not asked. I didn't ask about impact on the warranty. I asked if the Umarex regulator would handle higher input pressures.

Thanks for the response. I've seen a few PCP reviews on YouTube, the reviewer fills above the OEM working pressure for the cylinder/bottle. Often it is only a few psi over with a handful running 100 - 200 psi over. I've ordered a 500cc CFB which is more than twice the volume of the Zelos...

From various reviews and instructional videos on YouTube, I've seen a couple different approaches to the issue of Zelos bottle conversions. 1. It is OK to fill the new bottle up to its rated working pressure (e.g. 4500 psi) without an additional step down pressure regulator between the bottle...