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Proof / Inspection stamping |
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R6T8net
Recruit Joined: Dec 10 2016 Location: Leetonia Status: Offline Points: 10 |
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Posted: Dec 22 2016 at 7:22pm |
I'm sitting here perusing the barrel section of the website and noticed that every proof mark appeared to be stamped prior to plating (my two examples are the same). One can conclude that either every example was a rebuild or barrel proof firing and stamping in fact occurred prior to plating. If the later is so then the barrels must have been tested independent of any other components; correct? Anyone willing to shed light on the actual process?
In studying my 2.89M Underwood I noticed the flaming bomb stamps (receiver behind serial# and on top of slide handle) and punch mark (in front of serial#) appear to be done post plating. Were these inspections done at the component or assembly level? I'm a relative newbie and am hungry for knowledge (doesn't help that I own a mfg company and look at everything this way!). |
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New2brass
Moderator Group Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4627 |
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First and foremost, they are not plated. Plating I believe involves an electric current.
Very early carbines were done with Dilute, a form of bluing. Then they were finished with the Parco-lubrite process which is a phosphate coating. Some call this Parkerizing. Both chemically react with the metal and bond to the surface. The phosphate coatings hold oil better making them ideal for combat weapons. The barrel manufacturer marks and date were done before finishing. The inspection marks from barrel making process were also done before finishing. The proof firing marks were done after the finish. At times you can see metal "in the white" around these marks. |
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RedSpecial
On Point Joined: Apr 03 2016 Location: PBC, FL Status: Offline Points: 124 |
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Are you referring to the 1/16" P stamped on top of the barrel about four inches back from the muzzle? As I understand it, those were applied when the barrel assembly was proof fired. Some barrels were made as extras to the receivers so that they could be pumped over to other manufactures who were deficient on needed parts. In those cases those extra barrels were proofed when they were tested at the factory and then reproofed by whatever manufacture used it, which is why some barrels have two Ps stamped in them.
This is what I remember at least, and it could be I am remembering incorrectly. |
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-Neil
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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Been reviewing CCNL 361 Inland's 2nd serial number block, page 3:
As seen in earlier Inland sn blocks....barrels have punch mark on barrel in front of receiver. This mark was applied after finish application. Mark is similar to proof punch mark found on receiver in front of rear sight.....purpose unknown. |
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Ghostman
On Point Joined: May 31 2016 Location: Virginia Status: Offline Points: 106 |
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Usually a single punch mark is a mark left by the hardness test.
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