Quote Originally Posted by BTDT View Post

Recoil acceleration is, of course, only one of several contributing factors to hold sensitivity; displacement plays a part, along with surge acceleration and displacement. To maximise hold sensitivity would entail increasing all of the factors, easily achieved by fitting a very stiff mainspring with little preload, lightening the piston, over-shortening the stroke, or all at once. [/COLOR]
OK so a Haenal 303 with a stiff spring and a lightened piston.