At this late date we can only speculate about why that pis is so long. It is easy to change pins without it being detectable but it should only be necessary if the barrel is changed or set back.
The pis is indeed long and I do not recall seeing this before.
These pins were sized to diameter on a centerless grinder so it was most likely procured outside and then blued. Thar was teh process for the Model H-D Military. What level of inspection they used is unknown but I suspect it was on a sampling basis.
I have no specs for that particular part but somewhere I have data on pins for some later models and perhaps that will suggest the length tolerances.
Your measured scatter in length suggest to me that you have some different parts or perhaps some rejects that an former employee saved. Perhaps they were pinen from a completely different source.
John, There is one thing that bothers me about this Model "D" and that is the Barrel Lock Pin, It is longer than any I have seen and/or have on my other guns (Letter Model) At first I thought it... more
John, Thank you for your thoughts. There is no real GOOD reason the 2 sets of lengths are in the same envelop and I believe some one just combined 2 types (Different length.) The pin and barrel do... more
John, For what ever it is worth, In my stock of HS parts I have an envelope of the "Barrel lock Pin" and in that envelope is a batch of 85 pins. I measured these pins and came up with 2 groups,... more