Return to Guam, Spring 2012

A long-overdue return trip to Guam.  Didn't get as much time to wander as last time, but still tried to make as much out of it as I could.  Found some nifty stuff, including some U.S. rifle rounds, two large copper rifling bands from US naval guns, a nice brass artillery siting screw (3 oclock position), and an interesting lead syringe(?) tip (11 oclock position).  Anyone know what the two spark-plug-looking items are?