![War work in the groove. A modern rifling machine cutting the grooves in a gun barrel - PICRYL - Public Domain Media Search Engine Public Domain Search War work in the groove. A modern rifling machine cutting the grooves in a gun barrel - PICRYL - Public Domain Media Search Engine Public Domain Search](https://cdn4.picryl.com/photo/1940/01/01/war-work-in-the-groove-a-modern-rifling-machine-cutting-the-grooves-in-a-gun-1024.jpg)
War work in the groove. A modern rifling machine cutting the grooves in a gun barrel - PICRYL - Public Domain Media Search Engine Public Domain Search
![DeHoff #G560-B1, gun barrel button rifling machine, 1 spindle, 17-50 caliber, 48" barrel length, new for Sale | Surplus Record DeHoff #G560-B1, gun barrel button rifling machine, 1 spindle, 17-50 caliber, 48" barrel length, new for Sale | Surplus Record](https://files.surplusrecord.com/cdn-cgi/image/width=800,format=auto/listphotos/123733d.jpeg)
DeHoff #G560-B1, gun barrel button rifling machine, 1 spindle, 17-50 caliber, 48" barrel length, new for Sale | Surplus Record
![Rifling Machine (Larger image) | Expositions, where the modern technology of the times was exhibited. Rifling Machine (Larger image) | Expositions, where the modern technology of the times was exhibited.](https://www.ndl.go.jp/exposition/images/L/792l.jpg)