223 can, need to arrange about a 2" "stack" of washers, spaced about 1/4" apart, with "spacers" in between the washers, to hold them in position. the spacers are made out of tubing that is a slip fit inside the silencer tube, and these spaces are drilled with .100" holes, all around, so that the powder gases can be vented thru the spacers, and into the area between the silencers inside-tube, and the outside "sleeve' tube. Screenwire donuts won't stand up to a lot of rounds, right at the muzzle of the gun. a few score rds is all they can tolerate, before they start coming-apart-unraveling. If,however, you spare them most of that heat and blast-effect, by means of the washer-stack, the donuts will stand up to many hundreds of rds.