Bolt Action Pneumatic Spud Gun

No one should ever make a potato cannon. They are wildly unsafe, powerful, and can easily shatter your neighbor’s gaudy bay window, you know the neighbor with the mean dog.

That said, [Jeremy Cook] made a minature bolt action spud gun! Using a custom machined Delrin bolt, a fitted Delrin reducer, and some PVC, the spud gun is capable of quickly loading custom shaved potatoes with the greatest of ease. Pushing the bolt (literally a bolt) forward forces the spud through the reduction coupling and into the barrel. Lock the bolt to the side, pull the trigger (an air blower) and two expansion chambers toss compressed air behind your starchy projectile. The design is reminiscent of  a common bolt action rifle, but all that Delrin reminds us of paintball markers.

[Jeremy] is writing up the project in multiple posts, so check his blog for info. We are also no strangers to the strange, dangerous and wonderful world of potato launching tech.

Stick around for a video of the launcher in action!

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Autonomous Paintball Sentry Gun

What is the best thing about making a computer program that targets and kills anything that enters its sight? Why giving it a weapon, of course! No, we are not talking for real, but the next best thing, an Autonomous Paintball Sentry Gun.

The autonomous part of the device comes from a pc on the sideline and is fed input though a standard webcam. The feed is ran though a processing script where, once accustomed to the background has the option to fire at anything it sees moving, or a nice point n click manual mode.

The Arduino part is in a the role of driving the servo motors for X/Y movement and a trigger and is powered by a fist full of D cell batteries to give plenty of time for fun. Also, be sure to check out our other sentry guns, one using Microchip PIC, and another sporting a super compact computer running Ubuntu

Home Built Revolving Shotgun

Sometimes, you just need more ammo available. In this weapon mod, the chamber of a 12 gauge shotgun, a hammer from an 1857 Remington Perc Revolver, and other parts from an Italian auto shotgun were all combined to make this happen. The gun is of questionable legality depending on what state or country it resides in. Don’t quote us on it, but the members of the forum seem to think it should be fine anywhere in the US but California. Slightly more practical than other shotgun mods we have seen, the inventor has been kind enough to share some stills of the inner mechanisms to see how this gun ticks.

[via Neatorama]

Paintball Chronograph

This slick little chronograph can tell you how fast your paintballs are going, as well as what your firing rate is. In this instructible by [Klash69], you can see how to build one for yourself for less than $40. Chronographs themselves aren’t usually too interesting, but we thing he has done a great job here. You have a nice compact package with a big bright display. All it really needs now is a smooth enclosure. As far as the tech details go, he’s using IR sensors spaced 4 inches apart for detection, at the barrel. We’re not experts, but we think this might not work as well on a gun due to muzzle flash, someone who actually knows should let us know in the comments. The brains are a PIC18F13k50 and you can download a full parts list and schematic on the instructible.

You can see a video of it in use after the break.

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