PUBLIC Forums > Call For Assistance Feedback
Is there a name for this type of breechface?
Nancy McCombs:
Shandra, you would also not be incorrect if you called them arced BF marks, or overlapping arched BF marks.
Shandra Lynch:
Thank you, Nancy
Chris Monturo:
I would sway away from arched as they are traditionally associated with Beretta/Taurus 92/96 series where there is clearly a one way arch from the face milling process. If someone told me "arched" I would think Beretta/Taurus 92/96 style.
While what you have shown does have arches, it is a result of a different process. Beretta/Taurus is a one time swipe in an upward motion. What you have is an endmill used in conjunction with a rotation of the bolt face. This is similar to the Ruger AR-15 bolt face (pictured below). Overlapping endmill marks as Mark mentioned.
As for a one or two word term to encompass the situation....that may take some time to figure out. If you want a description, I would classify it as a breechface produced by an undersized endmill to produce the case head pocket (or overlapping endmill marks).
Not sure if that was much help because I didn't come up with a term, but it gives you the jist of what you are seeing.(edited to say that overlapping endmill marks pretty much sums it up the more I think about it)
Regards,Chris
Shandra Lynch:
Thanks, Chris.
Adam Grooms:
It would be curious to know what NIBIN is classifying this BF as? Maybe AFTE glossary committee can help define a standard term (ie. OE - overlap endmill)
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version