I posted this here because it is actually a kind of clever way to sell barrel blanks...You have to cut the threads before you can index the front sight ramp/blade, so they leave the front sight band round...
You cuts you threads, torques you barrel down, and then solders you front sight base on...And install you blade...
It's not how I would do it...Or even suggest it be done...FWIW, I would thread the front band as well and screw on a cut-off Luger front band/base/blade (internally threaded) indexed to line up correctly...Probably with a setscrew in the dovetail to hold it in place...
As sold, this is exactly what makes a gunsmith's heart sink when he sees a customer carrying a box into the shop...
