Discovery 177 to 22 conversion questions

[lethemgo]

So walked into a airgun store the other day and he had a rack of disco .177 for a good price so I bought a couple. Plan on turning one into a .22 and from what I've read it is as simple as a 22 barrel, bolt, and o-ring. Anyone ever converted one and is that all I  need. Also have a tank of co2 andvthinking about running the 177 off of it until I work up money for a tank and connections. Guy says it wont work, sounds like a new thing to me since they were supposed to run off of hpa and co2 and still list that in new gun adds. Anyone ever ran one on co2. Thanks guys!

[rsterne]

Yep, a .22 conversion is just barrel, bolt and bolt O-ring....  No reason you can't run either on CO2, but I think you will find it wastes a lot of CO2 with no additional velocity compared to what you could get with a much lighter hammer spring, or an RVA.... I would start with either a 2240 hammer spring, or a drastically shortened Disco spring.... Keep cutting the spring until you see a slight velocity drop, and the gun should be a lot quieter and get a lot more shots than it will with a stock spring on CO2....

You can use the RVA from a Challenger, it will fit on the back of the Disco, if you want adjustability....

Bob