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Nova vista liberty .22?

I have not tried lowering the reg pressure to reduce power, and don't recall anyone posting of doing so. You would probably need a lighter hammer spring to match the lower plenum pressure. I haven't used, but others have, the low power setting on the power wheel, would probably be better than messing with the reg. Without a chrony, changing power/tuning will be very time consuming. 

Yes, letting the air out is easy, getting it back in, a bit harder. ;) It's not too bad refilling from 2k, but from zero is a work out. You will also have to re-zero the scope, when you change the power.

i've said my peice on the wood vs plastic.




 
Where can one find the complete detail manual for HP-P900W as per picture below?

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Thank You Pieter