I am not an expert on HW 90s but ....
I have observed a small drop in power 1-2 fpe can totally change the feel of a rifle nd make it shoot easier ...better a 17-20 FPE hit every time than a high power 24 FPE miss
It work on spring plants so a tunable GAS RAM sure does make me jealous since ya can vary the level so easy no tear down
I have bought 500cc bottles from Best Fittings they ship fast to use on my .25 Mrod conversion
Any PCP hand pump would work with the adapter set up to fit on ....but if ya dont do PCP a hand pump would be useless and the slim set would rock for ease.
I would do some research on needed real world ram pressures as ya can get some shock pumps quite inexpensively and I am sure some modelsl do the right pressure range
Have you added the extra clamp screws to the RWS lockdown yet ??? Replace all the screws with a length that completely use all the thread depth available in mount base mine are about 2 threads longer on back side sticking out when tight
The tape is ABSOLUTELY NEEDED to line the RWS tube clamps
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