I love it... I've ordered some aluminium tube to make a new outer barrel so I can do away with the A-post (it's one piece on the CM16 raider) then I can change it out as and when I feel. At the moment the A-post is on and the inner barrel runs into the Surpressor, so I still get the satisfying 'thud' sound but benefit from the extended tight bore barrel.
The gun is very much a working project. Happy with it so far!