Guess quite a few of us have managed a PCP QB in one form or another.
In its simplest form:
All the smoothing/alignment/deburing mods outlined in the co2 tunes. New PCP tube shouldn't need to be smoothed/deburred.
Modding the valve a bit to make it a simpler non-piercing Delrin seal design (the issue valve stem doesn't live long at pressures higher than Co2 and the piercing pin assembly just clutters the air flow). If power is a goal, would search past posts on increasing the valve gas flow.
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![[linked image]](http://i157.photobucket.com/albums/t50/ribbonstone/valves/IMG_4649.jpg)
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Increasing striker hit to the valve in ordere to operate at higher than co2 pressures.
HAd used the same PCP tube on a .177...then used it on a .22...ended up with this long barreled .25 that pretty well followed the above.
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![[linked image]](http://i157.photobucket.com/albums/t50/ribbonstone/QB%20mods/DSCF1648.jpg)
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