Carbine Bolt I.D. Marks

[tspence35]

I have a Inland Carbine, 822xxx, with a Inland 9-43 barrel That I have owned for over 30 years. I finally broke it down this weekend and found identification marks on the bolt lug as follows: IO which would be Inland with a 2 on the same lug. Can anyone tell me what the 2 means? Thanks.
Also, it is a round bolt.

Information

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[Neal Myers]

Just guessing, an inspector mark? Doesn't really matter, the original bolt for your carbine was a flat top.

Neal

[JimF4M1s (Deceased)]

Your serial number is around the last quarter of 1943. The 9-43 barrel also trends to that.
I think a type 2 flat bolt with either a sideways 1 or 2 and upside down OI on the lug.
The #1 was used about OCT 1943-Jan 1944.
The #2 from about Nov 1943-March 1944.

[tspence35]

Thanks for all your help. I have owned various carbines for the last 50 years and have just recently starting searching for information about those carbines. I have learned a great deal by posting questions on the M1 carbine forums and also by reading your responses to other folks' questions. Again, many thanks.

[CrossedCannons]

So back to OP's question ... what does the 2 mean? What's the difference between a bolt marked "1" and a bolt marked "2"? Or did Inland simply contract with the Government to switch the stamping of bolts from "1" to "2" in November 1943?

[painter777]

So.........
What about these markings?

Cheers,
Charlie-Painter777



Same Bolts With Flash:

[emmagee1917]

If they were each found in thier own range / time period , I'd say an individual's inspection mark .
If found throughout all ranges , then the above or a production line stamp so if there was a problem they could narrow it down to one line to fix and / or recall that number bolt.
Chris