The UNISIG R-4-2-2 fully automated barrel cell is engineered and automated for continuous and synchronous production, capable of gun-drilling four barrels at once, while two gun-drilled barrels are ...

"The government admits that sometimes drilling a single hole can be the difference between a semi-automatic receiver and a machine gun receiver," Patterson said. "And a machine gun receiver is ...

New York prosecutors charged Mangione with murder, illegal gun possession ... percent involves some drilling and machining so that the other parts — the slide, the barrel, the firing mechanism ...