Irwin-pedersen

[Newscotlander]

Does anyone have an Irwin-Pedersen carbine with the serial number between 17778xx and 17905xx? This is the serial number range of the receivers which I suspect were made by Saginaw at Grand Rapids.

Bruce, I suspect the first 15,000 serial numbers were used by Irwin-Pedersen. Who knows how many receivers successfully made it through heat treatment, inspections, etc. and were used in production. there are plenty of examples of S'G' marked receivers with serial numbers in this range. Those were undoubtedly re-used serial numbers.

The second, roughly 15,000 serial numbers with the Irwin-Pedersen name stamped on the receiver may have been actually produced by Saginaw after the takeover.

[USGI]

I've been comparing the picture of the IP receiver posted by Mikey51 with my S'G' receiver S/N 1829338. The barrel date on my S'G' is 8-43. Below is a crude composite picture of the IP vs the S'G'. I don't know if this is significant, but to me there are obvious differences in the two - mainly the machining marks look different on the S'G'. For some reason the shape at the rear of the bolt opening appears different too, but maybe it's because the angles of the pictures are not the same. Were these receivers supposed to be made on the same machinery, or did SG bring in new machines when they took over? - Bob

[JimF4M1s (Deceased)]

Chris,

I had two. Gave one to my cousin, a 1.77 it had a 6-43 barrel. I kept the other 1.78 but it has a 12-43 barrel that I alway questioned as too late.
One reason is I also have an S'G' 1.86 with a 9-43 barrel.

Don't know if that is any help or not.

Jim

[Bruce McAskill]

Chris, I misread something you had posted earlier and that is my bad. Funny as to how most of the IP serial numbers listed here are in the range of 1.771 to 1.778.

[Arcieri]

CMP auction rifle.

Also came with an S'G' bolt with an IP firing pin. A couple other IP parts and the rest of "mixed manufacturers" as they say.

Has a 3-43 dated Rock-Ola barrel.

Can't really tell if the bolt was original to the rifle. I guess some carbines came to CMP with bolts attached while the majority did not.

Attachment 21207Attachment 21206Attachment 21205


Ray

[Newscotlander]

Ray, Thanks. Is there an M2 or M4 stamped on the right side of the op spring housing near the rear? I can't read what it says.

[Arcieri]

There is an M2 marking there. I thought it was a 12 at first. I'm reading and re-reading War Baby trying to figure out the IP, SG, S'G' story!

The S'G' slide also has a letter J on the side.


Ray


Attachment 21215Attachment 21214

[Maniac]

There is an M2 marking there. I thought it was a 12 at first. I'm reading and re-reading War Baby trying to figure out the IP, SG, S'G' story!

The S'G' slide also has a letter J on the side.


Ray

FWIW Ray, my 1.87 mil S'G' has the same sideways J in the same location as yours

[Mikey51]

Are they M's or N's ?Attachment 21216

[Arcieri]

I'm not sure what the stamping stands for. I have studied it under fairly high magnification and can't make out the other leg if it is an M. It was either stamped too far back on the radius if stamping occurred after milling or was stamped before the radius was finalized. Could have worn down in use also I suppose.

Ray