[Jeff Rodriguez] has been busy testing a feasible DIY method for rifling a barrel and has found some success using salt water, a power supply, wire, and 3D printed parts to create the grooves of ...

1498 - Rifling principle is discovered. 1509 - Invention of wheel lock (rose lock). The next major advance, the wheel lock, generates a spark mechanically. With no wick to keep lit, the wheel lock ...

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