The barrels and mounts both work fine with the X-22. This pic is as far as it needs to turn before pulling forward and separating the two halves :
As for the muzzle...lots of people have asked about an XB-5 for it. Unfortunately there just isn't enough diameter to make these. The O.D. at the muzzle is .640". There will be a thread protector coming soon, I will post here when they are ready.