DWM Commerical breechblock question - Page 2

saab-bob · 02-25-2015, 11:47 AM

Hello Gents
Got some more pics of my gun.
1 pic is back of frame-no sign of the toggle hitting hard?
2-pic of extractor and firing pin in breech block
3-pic of firing pin tip
Thanks again for all the help.

You folks are the best!
Bob

rhuff · 02-25-2015, 02:19 PM

In photo #2, it really shows the breechface depression.....unless the photo is tricking my eyes.

ithacaartist · 02-26-2015, 11:50 AM

Quote:

Originally Posted by sheepherder

How about if it was extensively dry fired, and the owner tried to remove the resulting 'ridge' by use of a round stone in a drill...or even a drill bit...

It all looks smooth and regular, although a slightly different color than the rest of the flat surface there. I'm doubting a rotatory stone or burr..maybe a drill bit sharpened at a verrrrry shallow angle (which, itself, would be hard to center?), but a long time ago because the area does show some "age" in the pics. The base of the cone of the f.p.'s tip looks a little gnarly in the pics, how much dry firing would be necessary to achieve this?

Perhaps an experiment is in order. Pounding a sacrificial firing pin repeatedly into a sacrificial breech block would answer a lot of questions. As I understood it up until now, the damage risked by dry-firing was that the tip of the f.P. would work harden and become more brittle--enough to snap the tip off with the shock and momentum involved in the dry-fire. I'm still skeptical that a cone pounded into a cone would produce the mushrooming/upsetting around the hole.

Sergio Natali · 02-26-2015, 02:35 PM

I'm my opinion it's very unlikely that an expanding primer can cause the indent in the breech face.
IMHO

Sergio

aldo35 · 02-26-2015, 05:51 PM

I have a hard time visualizing dry firing causing this deformation. I would think dry firing would have caused the deformation to be convex not concave.

Aldo35

02-25-2015, 11:47 AM	#21
saab-bob User Join Date: Jul 2009 Location: So Cal Posts: 459 Thanks: 774 Thanked 143 Times in 87 Posts	Hello Gents Got some more pics of my gun. 1 pic is back of frame-no sign of the toggle hitting hard? 2-pic of extractor and firing pin in breech block 3-pic of firing pin tip Thanks again for all the help. You folks are the best! Bob Attached Thumbnails __________________ "I think,therefore I own guns"

02-26-2015, 02:35 PM	#24
Sergio Natali User Join Date: Feb 2013 Location: Somewhere in Northern Italy Posts: 2,646 Thanks: 1,087 Thanked 1,783 Times in 1,007 Posts	I'm my opinion it's very unlikely that an expanding primer can cause the indent in the breech face. IMHO Sergio __________________ "Originality can't be restored and should be at the top of any collector's priority list.

02-26-2015, 05:51 PM	#25
aldo35 User Join Date: Jul 2010 Location: Northern GA Posts: 390 Thanks: 2,298 Thanked 184 Times in 91 Posts	Breach Deformation I have a hard time visualizing dry firing causing this deformation. I would think dry firing would have caused the deformation to be convex not concave. Aldo35

02-25-2015, 02:19 PM	#22
rhuff Patron LugerForum Patron Join Date: Mar 2011 Location: Az. Posts: 2,308 Thanks: 2,737 Thanked 993 Times in 729 Posts	In photo #2, it really shows the breechface depression.....unless the photo is tricking my eyes.