grocery list for RWS 850 AirMagnum HPA conversion?

[ray1377]

I seriously want one of those 850 AirMagnums in .22 caliber and do a HPA conversion on it.
Does anybody here have one that they have done that to?
If so, what did you have to buy "other than the 850" in order to do it?
I know the high pressure tank and a regulator.
But what pressure regulator do you use?
And does it screw right into where the 88 gram cartridge goes or do you need some sort of adapter?
Help please, and pictures would be appreciated.
Thanks Ray

[lastmanout]

There is a forum dedicated to the 850 over at the 54 airgun forum. Lots of info that you seek.

[spysir]

nice having information on different forum just in case someday on of them goes away.
 I havent tried the 850  I have shot the Walther 1250 which is more or less the same airgun (?) except for the 3500psi fill and several hundered dollars, maybe there are other differences and you can let us all know?
 Other than ALL the white letter WARNINGS stamped all over it, the trigger after much work by a a fellow who  knows airguns in general quite well ( which is where the "850 forum might help???) was awful, the safety had to be removed to get it under four pounds. Other than that it did group very well.
 I use a Ninja paintball tank/reg on a QB .22 set from the factory at 850psi (not verified by myself just the claimed number) and with 15.9 JSB it shoots at 580fps.  The Ninja is 2" dia. so "if" you have room on the 850 for a 2" tank the only other part you need is the AS to painball adaptor. A complete rebuild kit for the Ninja is $10.00 and includes a full set of adjustment washers. Naturally they do NOT recomend changing pressure.

 Kepp us posted,

 John

[preez]

22ci or 13ci tank (22ci better IMHO) with regulator from JDSairman.com. Regulator set from 1250 to 1800 psi, depending what fps you are looking for. 1250 will do 700-750 fps in .22 while 1800 will do 900 fps in .22

Replacement hammer spring from 850store.com to smack that valve harder. Let Roald know what pressure you're using he will send you the right strenght spring.

Short B&A adapter from Bryan and Associates

                           OR

Get the full kit, soup to nuts from 850store.com which includes all of the above and priceless advice and instructions from Roald

Don't forget some kind of LDC to control the bark, which is substantial on HPA

Some power mods are a priceless trigger mod are available on 850 forum mentioned earlier in this thread.

Hope this helps
Chris