The vast majority of those “100 weapons” seem to be pocket knives, pipes, and chains. We are likely seeing “weapons inflation” here. It appears that most of the dead were shot at the entrance of the restaurant. In the article referenced below, it gives the number of weapons found both as 1,000 and 50. I suspect that the 1,000 is a typo, where they meant 100. I hope that we will eventually know what happened.
“Three of the dead were found in the parking lot just outside of the restaurant, four were found in front of the building and one had been dragged behind a neighboring restaurant, Swanton said.”
http://www.kwtx.com/home/headlines/Waco-Shooting-Near-Twin-Peaks-In-Waco-304043711.html
I bet a lot of them had those deadly wallet chains!