CSA uses a coil mainspring, the MVA is a flat mainspring. You would have to go with a double set trigger bar, and by the time you get everything switched around, you would like be ahead to just get the MVA dst action, and have another rifle put together.

the double set triggers guns have a longer sear

OVW…..the replies here pretty much covered it.  You’ll need a complete double set trigger tang and a long tailed sear.  You will likely have to remove some wood where the butt stock is inletted.  Where you need to remove material can usually be identified using inletting black. 

I did hear of a person who attempted this conversion and occasionally experienced a situation where the action locked up and couldn’t be opened after firing.   I received a phone call on this issue but couldn’t determine what the problem was.  I never heard if the situation was resolved or what caused it.  My suspicion was that some wood in the butt stock was interfering with the long tail sear when one opened the action.

Good luck.

Thanks for all the replies.  Lots to consider - especially the dollars signs.  I knew the CSA highwall was different with the coil spring action which makes the conversion more complicated.  I may opt for the single set trigger - I’ve had the opportunity to shoot a few CSA highwalls that had one and they are a nice improvement over the standard trigger.  

If anyone has other thoughts on this, I would always welcome your input with a PM.

Thanks again.

OVW

there is no deafferents in the the trigger system on the flat spring and coil spring High/low walls ken