Reply To: FX Impact .25 with JSB MkII 33.95gr — what FPS are you getting?

Forums PCP Airguns FX Impact .25 with JSB MkII 33.95gr — what FPS are you getting? Reply To: FX Impact .25 with JSB MkII 33.95gr — what FPS are you getting?

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sniperlabyo
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“Drumsnguns”Ernest I’m not sure how this plenum tube operates but it is interesting that you are getting such a large increase in velocity. Is it just a larger reservoir of air we are talking about?
Mine gets 860 fps maxed with 34gn Heavies. Other guys are getting much higher. like 880-895 I’m thinking that my probe is not lined up properly with the air transfer port.

impact has a small air reservoir/plenum space so it’s limited to around 860- 875fps.

when you shoot at reg setting at around 150b its doesnt have enough are volume to maintain a high bar setting through out the barrel length before the valve close and the reg takes a little longer to refill the chamber back to150b.

I bored out the TP to 4.5mm from external tube to reg chamber to have more air passage/less restriction.

The guy that has a larger lung will shoot a dart with greater velocity. !!!!