The Poor Man's Chronograph Feb 24, 2008 23:14:00 GMT -5 blackheart likes this Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Zorak on Feb 24, 2008 23:14:00 GMT -5 Red Wolf Airsoft has an article on how to use a pop can as an improvised chronograph. Airsoft Retreat did some testing and validation work.