Picked up the new Havoc box set for my
CSM but didn't need the heavy bolters or autocannon so I started looked for an options for gun barrels to change them into the Reaper chaincannons. At first was going to build my own. Even was going to cast my own from the new Obliterators (even made the mold - just got lazy and didn't want to mix small amounts of resin to make them one at a time). While I was looking around on Dakka I came across another post that had pictures of what I was looking for.
Got them from Red Dog Minis. Great price, fast service, and a fellow Dakka member. I was really happy with their protuct and thought I'd share what I found in hopes to send others their way.
https://www.reddogminis.com/catalog/item/9023820/10408018.htm
If you look closer at the second picture (sorry for the not getting a better picture - got someones help but forgot to check it before they sent it to me) you can see that I filled in the small section where the barrel goes into the body of the heavy bolter.