Luger barrel question

[sheepherder]

Originally Posted by G.T.

...I have been eyeing the button for sale on ebay...

Gerry - (if you're still around) Does the 'button' cut the grooves or does it form them??? Broaching cuts the channel and 'stores' the chips in it's saw-tooth-like gaps between the teeth...I've never seen a button so I'm wondering if it actually cuts or just deforms the metal...

[G.T.]

Hi Rich, I guess for a better term, it most likely swages its way thru the bore? As I see absolutely no provisions for chip clearance... Just an excellent example of brute force overcoming resistance?.... I've seen sharp tools cut several thousands effortlessly, and by the same token, seen a .001" or .002" upset hold tons of force?... ...
As for the button rifling process, It looks insanely easy to do.... but, also, not cost effective as a cheap "button" is going to be a couple of hundred all by it's self... I'm challenged enough with just threading the tenon... ... Best to you Rich, til....lat'r....GT......