We're sure you've dropped your share of enemy-shredding sentry guns across various different games by now, but how would you like to have one in your own back yard? Thanks to the open source sentry gun project, you might just be able to. Of course it probably wouldn't be the greatest idea if birds and critters tend to hang out in your backyard, unless you want PETA to come knocking.
Although you can use either an airsoft gun or a paintball gun, we found the paintballs to be much more effective and entertaining. All you need to make your own is a paintball gun, several off the shelf parts and a few pieces of good old open-source code. The sentry gun tracks its moving target using a webcam placed on the tripod, which the laptop then translates into corresponding movements for the servo motor controlling the gun.
Once the target is locked on, the fully automated sentry gun blasts away until its victim finds itself a tree to hide behind. As fun as creating your very own paintball or airsoft sentry gun may be, we're guessing the authorities won't be too happy about it. If you're looking to build your own regardless, head on over to Project Sentry Gun to get started.