U.S. Model 1917 Firing Pin Inquiry - M14 Forum

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U.S. Model 1917 Firing Pin Inquiry

This is a discussion on U.S. Model 1917 Firing Pin Inquiry within the Steel and Wood forums, part of the Rifle Forum category; I recently purchased a "new" (spare) firing pin (aka "striker") for my U.S. Model of 1917 from a reputable company. Upon inspection, I notice that ...


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Old January 6th, 2017, 11:25 AM   #1
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Question U.S. Model 1917 Firing Pin Inquiry

I recently purchased a "new" (spare) firing pin (aka "striker") for my U.S. Model of 1917 from a reputable company. Upon inspection, I notice that the tip of the spare firing pin is squared off (similar to a drive pin punch) rather than rounded. I confirmed that the diameter of the tip is .075" (i.e., proper for a M1917).

I noticed, too, that the length of the purchased spare is slightly longer than the rifle's existing firing pin. With the bolt removed from the rifle at half cock, the tip of the spare is precisely flush (no protrusion) with the bolt face. In the same half cock condition, the tip of the old, existing, firing pin is slightly below the level of the bolt face (i.e., not flush).

I have dry fired the rifle with the spare firing pin using a new A-Zoom snap cap and note the primer indent is well define, but it does not appear excessive compared to that made by the rifle's existing (used) firing pin.

The spare firing pin is marked "R" (Remington). I understand that some firing pins were marked "X" and required fitting by a field armorer. My spare firing pin, however, does not show any "X" marking.

My questions:

Is my newly acquired spare firing pin one of those that requires "fitting" to be serviceable (and safe) or is it normal for a new firing pin to have a flat tip? I thought all issued firing pins had rounded tips?

What is the risk, if any, of leaving the tip flat and flush with the bolt face (at half cock) rather than rounded and slightly below flush?

Is there any increased risk for piercing cartridge primers using a flat tip firing pin when firing the rifle?

I've attached a photo of the two firing pins. The "new" spare pin is on the right. Note the squared off tip and the comparatively long protrusion.
Attached Images
File Type: jpg M1917 Firing Pins.jpg (91.3 KB, 8 views)


Last edited by GoodGuy; January 6th, 2017 at 06:47 PM. Reason: Attached Photo
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Old January 6th, 2017, 11:40 AM   #2
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could have been an upgrade to prevent piercing primers,or different maker

ww1 vs ww2

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Old January 7th, 2017, 09:46 AM   #3
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Update... I measured the spare firing pin protrusion and found it measured 0.076" (average of several measurements). That's a little outside the original specification I found in my research (0.058" to 0.068"). I've modified the tip so that protrusion is now 0.068", and I've lightly chamfered the edge of the tip so that it now has a somewhat more rounded profile. I think I'm good to go.


Last edited by GoodGuy; January 7th, 2017 at 10:10 AM.
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Old January 7th, 2017, 01:04 PM   #4
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Might be a firing pin meant for a British P-14. Might be aftermarket.

The US Rifle of 1917 was a continuation of the British P-14. The original British contract did not have the parts interchangeability requirements of the US Ordnance board. In fact , the 3 makers had a hell of a time 'getting on the same page' as it were. There was a firing pin protrusion gage so the pins could be fitted to each bolt.

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Old January 7th, 2017, 09:01 PM   #5
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Don't know if these will help:

http://www.replicaplans.com/Firearms...%20P14-P17.pdf

http://www.replicaplans.com/Firearms...eld%201917.pdf

The first is a .pdf of the base shop manual (circa 1943)
The second is a .pdf of the Manual for the 1917 (circa 1918)

The shop manual does show the firing pin protrusion gauge

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