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Old 09-03-2006, 02:36 PM   #1
 
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Punch marks on rear of receiver

Just wondering what to make of the punch marks on this CMP auction carbine receiver. Obviously been through rebuild for EL Salvador use and who knows what other historic service. I just havn't seen the punch marks on the rear as these two marks are located.

rear receiver punch marks
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Old 09-03-2006, 03:51 PM   #2
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from the looks where it is it to shadow line of something being there.......they could have riveted a plate or a tag in that area, maybe for a rack number?
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Old 09-03-2006, 04:56 PM   #3
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The line is just a milling mark. On some carbines the milling in this section is crosswise while on others it is longitudinal. The punch marks look like hardness test marks to me.
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Old 09-03-2006, 05:18 PM   #4
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Punch marks indicate the receiver was tested with a high pressure test cartridge.
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Old 09-03-2006, 05:47 PM   #5
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Bill, I thought that was the punch mark in front of the rear sight pedistal.
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Old 09-04-2006, 03:08 AM   #6
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You are correct, I did not read the location.

Actually that punch mark does not look like a high pressure test punch at all. Usually it is not rounded. I does look like the results of a hardness test.
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