1, Pez Muzzle can this is New and has only seen 5 17hmr rounds through it,
its a 1/2" UNF thread, and is usable from .17hmr up to 223 cal according to the pez site,
( not on ticket and has never been on one so is totaly legal to be sold and posted within the UK.)
just under 8"long.
like new does not strip down as its fully stainless steel, so all you do is spray with a bit of wd40 leave and crack on next time.
this is the pez web site info.
Small Muzzle Can
.17 to .223