The wooden bullets are actually blanks, designed to be used with an adapter screwed on the threaded muzzle.
On edit:
Like this: http://www.surplusbunker.com/index....d=4237&zenid=2b7b67865baabd984d8e5fa10559bdc3
On edit:
Like this: http://www.surplusbunker.com/index....d=4237&zenid=2b7b67865baabd984d8e5fa10559bdc3