I have just checked my HW77K, 97K and shortened HW80. None of them are anywhere near 30cm from the point of ignition (where you put the pellet in) to the muzzle end. The muzzle end of the 97K is the end of the permanently fixed silencer/plenum chamber.
EDIT: I mean anywhere near less than 30cm.
Last edited by rogb; 20th September 2013 at 08:05 PM.