WTK : Will CMMG Stainless Steel Conversion work in SPIKES ST-22 Upper?

Looking at the CMMG Stainless Steel Bolt Kit (should be able to run better dry than the spikes)

Will this work in a Spikes Dedicated ST-22 22lr Upper or are they made to only work with their kits? (I know they are both based off the same design but you never know)

Anyone doing this?