Operational tests of the Starfire multi-chamber gun propulsion launcher began in 2011 and will continue throughout 2012 with commercial flights beginning soon after. They currently have a $65,000 kickstarter to get to suborbital launches.
Unlike conventional gun launchers, The Starfire launcher separates the propellant charge into several smaller charges which are fired sequentially as the vehicle moves down the bore of the launcher. This technique substantially reduces the g loadings that the vehicle experiences while still maintaining the high velocities and efficiencies of a gun launch system
If you liked this article, please give it a quick review on ycombinator or StumbleUpon. Thanks