[smoky]

Because you have a hammer forged barrel does not mean it has polygonal rifeling.

Apples and Macintosh's

Dwight P

That is correct. And 10/22Ts DO NOT use polygonal rifling.

Glocks DO NOT use Polygonal rifling since you can see lands inside the barrel. Glock Marketing people can call it what they want, but they certainly exaggerated. Glocks use a modified hammer forged rifling.

Take a look at a HK 91 or P7 if you want to see a true Polygonal barrel. There IS NO LANDS. The shape of the interior of the barrel resembles that of a polygon there is no conventional rifling at all. HK patented and perfected the real Polygonal rifling. You can use lead bullets in a true Polygonal barrel. I've done it.

 

[smoky]

No one outside of HK in Oberndorf Germany makes a true polygonal rifling on modern barrels that I know of. HK is the only manufacture to have perfected this type of rifling on a barrel making hammer forging machine. Unless HK get into the 10/22 aftermarket barrels your out of luck.

FWIW Most if not all all hammer forging barrel making machines come out of Germany. Ruger bought its 1st one in the early 90s and it cost more than 2 million dollars.

Kahr and some IMI guns baby Eagle for example do indeed have a true polygonal rifling. They bought their barrels from HK.

I see glock has created much confusion about this subject. They also got it wrong. A polygon is defined as a FLAT many sided geometric figure in the English language. There is nothing flat about glocks rifling.

In convention rifling lands join the grooves with a relatively sharp perpendicular edge.

Glock rifling is is unconventional in that lands do not join the groves with a sharp perpendicular edge. But rather a rifling that is basically radiusing the intersection between land and groove. Very much like 5R rifling that was popularized by Boots Obermeyer. I suspect the reason why glocks are allergic to lead bullets is they used way to much of a good thing (very large radius) creating to much surface area for friction and heat. Because 5R rifling is supposed to do very good with 22LR lead bullets.

There are other barrel makers producing and experimenting with this type of rifling. Obermeyer and the rest are using cut rifling. I don't think we will see button rifling used in this case because of to much tool pressure for successful process all the time.

 

[smoky]

Smoky, you are incorrect about Kahr getting their barrels from HK. They get their barrels from Lothar Walther. If you go to the Kahr website and click on barrels it will take you to a page on how their barrels are made and it states clearly that the barrels are made by Lothar Walther, I have always heard of very good things about Lothar Walther barrels so I found that interesting.

Was unable to find anything about how barrel are made barrels on Kahr website. But I will take your word for it. The German barrel maker of Lothar Walther definitely has the technology and facilities to make them.