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, "Group 1" is shorter ranging from @.610 to @.625 more precisely -- 1 at .610, 11 at .615, 38 at .620, and 3 at .625.
Group 2 are longer ranging from .650 to .685 and more precisely -- 1 at .650, 6 at .655, 13 at .660, 5 at .665, 4 at .670, 1 at .675, and 2 at .685. Again approximately but none the less a mean determined in both groups. The smaller group would be recessed if used as a barrel lock pin so I wonder if these are mixed and used elsewhere.
The longer group with a mean of .660 which would be just about right for the frame with what I see on my guns.
Now keep in mind I am not insane I only did this as on my latest acquisition (Model "D") the pin was longer then I have noticed and I guess if they pulled from a bin of parts it looks like based on my stock of the barrel lock pins and after measuring them all it could happen.
Did you have a spec for length of this pin? If I had to guess it must of been around .655 - .660 +/- .003.
Anyway a fun little exercise based on my observation and questioning of what I have.
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
Hello Tom, 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 ... 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
Barrel Lock Pin Data Tom Jones SFSD,Sun May 6 00:24