You may be right.
I wanted to be able to shoot with a compact silencer, and then have the option for the "Hollywood" quiet can by adding the extension.
I was not able to get the perfect thread job with the small amount of metal available on the muzzle even after trimming back the front sight. It is not as nice as the thread job on my 9mm HP so I think the can will not align as well as it could. I may have to use a generous bore to prevent baffle strikes.
Ranb