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the Daily hi thread
Umarex 850 m2 pcp convertion?
- Thread starter scoza111
- Start date
Ratman72
Super member
Hello, You can buy and Adapter and fit a Paint Ball air tank , Check out a post by Peddy September 2023, saying this i am sure the tank screws straight in , You will need discard the forend or cut to suite, Paint ball tank about £40
Thank you sir
Ratman72
Super member
Hello, Let us know how you get on, My bottle was a Protoyz 3000 psi 13 ci and it is about same dimension as the 88 Co2
AndytheCourier
Member Extraordinaire
Not done an Umarex but have converted a Crosman 2250 AS. 1st job is to Chrono it as is the Crosman gave about 9ft/lb on CO2 so gave some room for maneuver.
3 Parts to the conversion
1 Adapter. I got mine from Gmac, unfortunately no more. They are available on Ali Express but suppliers seem to come and go on there so hard to provide a link . THIS seems ok at the moment.
2 Regulator. CO2 is about 850psi if you gun is running over 10ft/lb stick to this. As I said my Crosman was about 9 so a 1000psi reg took it upto about 11.5ish.
3 Bottle Whatever fits, Paintball bottles tend to come reglated at 850 to keep in line with CO2 but some are designed to be a direct replacement for an 88g CO2 size wise.
None of these are an off the shelf answer so a fair bit of suck it and see involved
Good Luck
3 Parts to the conversion
1 Adapter. I got mine from Gmac, unfortunately no more. They are available on Ali Express but suppliers seem to come and go on there so hard to provide a link . THIS seems ok at the moment.
2 Regulator. CO2 is about 850psi if you gun is running over 10ft/lb stick to this. As I said my Crosman was about 9 so a 1000psi reg took it upto about 11.5ish.
3 Bottle Whatever fits, Paintball bottles tend to come reglated at 850 to keep in line with CO2 but some are designed to be a direct replacement for an 88g CO2 size wise.
None of these are an off the shelf answer so a fair bit of suck it and see involved
Good Luck
marflow
Super member
i wish the old 850 forum was still up and running we in the states had one guy doing the HPA conversions and he ran the forum
one thing you will need to do is change the hammer spring from a 1250 Dominator
the factory hammer spring has a hard time opening the valve with HPA, so you will have the opportunity to see the insides
be aware your gains will be modest but will be more than factory
https://www.airgunnation.com/threads/rws-hammerli-850-hpa-conversion.174769/
when it doubt just Google it
one thing you will need to do is change the hammer spring from a 1250 Dominator
the factory hammer spring has a hard time opening the valve with HPA, so you will have the opportunity to see the insides
be aware your gains will be modest but will be more than factory
https://www.airgunnation.com/threads/rws-hammerli-850-hpa-conversion.174769/
when it doubt just Google it
Ratman72
Super member
Hello, I never had any problem with my 850 or changed the hammer spring, just took of the forend off and fitted the Protoyz bottle, these have a safety valve, Mine was the 13 c i 3000 psi , filled to 3 on the guage
Old thread but my five eggs,,, in 22 std 850 magnum 16g pellets,,,1000 psi output locked down the valve no go bang bang, 850 psi and a rather tasty 14 lb/ft based on calcs of course, two shims removed 7lb/ft 1 shim 9ft/lb, 800psi perfect tad over 11 ft/lb rock and roll