There are different views making the rounds on the blog and forum sites regarding the weapon George Zimmerman used to kill Trayvon Martin. What makes it click, so to speak. To help clarify this and allay future confusion, please watch the two following (short) videos on the Kel-Tec PF-9.
In the first video, the shell casings on the gun eject up and to the right, with not enough force to do any real harm. You can clearly see the casing trajectory and get an idea of the speed of the 7 shots in the clip. This particular gun is a locked-breach, semi-automatic that needs to be primed initially. This would be of significance because it could mean that either Zimmerman always kept it primed, which is unnecessary, or he primed it before encountering Trayvon Martin.
The 9mm pistol has an automatic hammer block safety, which is not the same as a trigger lock safety that stops the trigger from being squeezed. A hammer block is similar to a firing pin block that prevents the hammer from contacting the firing pin by utilizing a safety latch. With the Kel-Tec, there is no lock or latch. What keeps the gun from firing is simple. The hammer can only contact the firing pin by pulling the trigger. Yes, that does mean that it’s always ready to fire as long as the chamber is primed.