steve_b_wales Posted November 2, 2009 Report Share Posted November 2, 2009 I read on a different website that the Theoben gas ram that's fitted to this rifle, can have the pressure increased to around 19 ft/lb by means of putting air into it through the rear of the ram. Has anyone else heard of this. If it is possible, I would like to do this to mine and declare it on my FAC. Thanks Steve. Quote Link to comment Share on other sites More sharing options...
Aldous Huxley Posted November 2, 2009 Report Share Posted November 2, 2009 Speak to your feo before you uprate it, otherwise you are in posession of a firearm off ticket, which means you will have to be very careful about dropping the soap for five years Quote Link to comment Share on other sites More sharing options...
steve_b_wales Posted November 2, 2009 Author Report Share Posted November 2, 2009 I take on board what you say. I'm having a slot added (soon) for FAC rated air rifle, before I do anything. What I want to know is, can this be done with the HW90? Cheers. Quote Link to comment Share on other sites More sharing options...
mr salt Posted November 2, 2009 Report Share Posted November 2, 2009 (edited) yes nearly all hw can go over 12ft.(alot are already ) if its gas ram you can buy a pump and pump it up. things like the hw 97 or 80 can be tuned with kits. (v tune glide kits) ox or titon main springs . More spring, less piston weight etc. I will warned you, air gun tunning is an art ,its ok to try but you may ruin a really lovely gun. I have seen people respring a rifle only to make it almost unfireable. And kick a scope to death. The gas rams are good,it will be more likely to leak if you really over pump it . You used to be able to buy a pump for about £90 (about two years ago)Shop will do it if fac. This is a funny little hand pump,not a pcp stirup pump. I feel you would be better off buying a .22lr if you are after power. tho yes you can take the hw over 12 ft/lb. Dont get done for not having a fac,power is not everything with a airgun. Sorry about my spelling am very ill today,hope what i have wrote reads ok ,and helps. cheers scott forgot to add your not going to gain much for 11ish ft/lb to 18ft/lb. the money would be better spent on a better scope If you want to ask an expert phone ben taylor and son (Ben of theo)(ben) ,in cambridgshire. You will get a yes or no. Edited November 2, 2009 by mr salt Quote Link to comment Share on other sites More sharing options...
steve_b_wales Posted November 2, 2009 Author Report Share Posted November 2, 2009 Thanks for the reply/s. I will have to think about increasing the power. I have .22Lr's, the air rifle will fill a niche where the rimfire cannot safely be used. Steve. Quote Link to comment Share on other sites More sharing options...
mr salt Posted November 2, 2009 Report Share Posted November 2, 2009 may be worth looking at a pcp ,thats putting out 20ish. already on fac. Quote Link to comment Share on other sites More sharing options...
bullet boy Posted November 3, 2009 Report Share Posted November 3, 2009 Yes Steve you can upgrade your Gas Ram powered HW90 to FAC by means of a Theoben pump. Quote Link to comment Share on other sites More sharing options...
windrush Posted November 4, 2009 Report Share Posted November 4, 2009 I remember reading a while back that just increasing the pressure does not convert a non-fac HW90 to fac rated - it requires a number of different internals. There's all sorts of issues with piston-seal burnout etc. And apparently the accuracy suffers and becomes really inconsistent. Not sure how much of this is to dissuade someone from doing it and how much is actually true. I suspect there's a fair deal of truth in it. Quote Link to comment Share on other sites More sharing options...
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