The hori in me says....why Needed?? If worried you could always do enough wraps of insulation tape around barrel to contact can....or try it without bushing. Pretty sure gunworks could sort it for you even though it's not one of thiers. Flick up photo ,someone will know.
I thought that until I ran a second hand suppressor without a bushing. Would sight in and be great for about 5 shots and then who knows where the projectile was going. Bushing fitted and issue gone.