Krieghoff Luger

[alvin]

"I washed my hands before lunch"

When the lug was chopped off, there would be no easy way to turn it into a NFA weapon (Short Barrel Rifle) as defined by 1934 GCA. So Uncle Sam could not confiscate this legal gun. That could be one reason. Although law did not require chopping it off, I heard many guns were reworked this way in the past.