Thought it was cool when I found this and picked it up. About two seconds later realized that it looked like a rocket warhead and put it down, took this photo and walked away really fast. Looks like it's from a 2.75 rocket. It's different than the other tips that I was finding. This one has a screw on tip (fuse?). Maybe it's a dummy, but I didn't touch anything that I wasn't sure about after this.