On Bollinger Canyon Road near Las Trampas. The missile silos are used by Tracor Aerospace as part of their assembly facility - I believe they make explosive bolts, chaff dispensers, and other small pyrotechnic devices. Previously, this was where the Gyrojet rocket pistol was made. A half mile south on Bollinger there are some Nike-era buildings being used as the Las Trampas park office.
http://www.insidebayarea.com/oaklandtribune/localnews/ci_3931081
They used a solid rocket propellant; when it finished burning, it lit off the black powder pellet, which ignited the magnesium. They were an interesting weapon concept, and I got to see several test firing.
There were also plans for both rifles, and larger versions that would be fired in an array, like some of the WWII rocket launchers.