Quote Originally Posted by bighit View Post
some people are using suspension shock pumps from mountain bikes
https://www.tredz.co.uk/.RockShox-Hi...0aAlDWEALw_wcB

so unless its a top end branded one the gauge may read wrong.

if using a pcp tank to fill i dare say it would be hard to stop it blowing a seal if you let too much air rush in . having never used a pcp tank to pump one up i may be wrong. using a hills type pcp pump would be safer for me anyway.


according to a post on here in 2006 the hw90 needs to be pumped up to 17bar . which is around 260 psi

http://www.airgunbbs.com/showthread....-gas-ram/page2

but i have heard loads of different pressures being mentioned .
The initial pressure you pump to is not critical as long as it is not too high to cock the rifle or damage the seals. It is very unlikely you are going to get exactly the power level you want without tapping the valve to release a bit of air. If you put too much in at your first try the 90 will be almost impossible to cock. I use a Hills pump.


Baz