M1 Carbine Part 6: Component markings and manufacturers

I know that this has been a long time coming and we’ve still got a long way to go; we’ve still got to reassemble everything, take her to the range and see how she shoots and I finally got the bolt tool and piston nut wrench from the CMP e-store so we need to discuss using those tools (as well as another cool toy I got from them).

To recap what we’ve done so far:

In M1 Carbine Part 1, we took a look at the external condition of the new old CMP M1 Carbine.

In M1 Carbine Part 2, we disassembled the M1 Carbine into its major groups.

In M1 Carbine Part 3, we disassembled the Trigger Housing Assembly into its individual components.

In M1 Carbine Part 4, we disassmbled the bolt without using the M1 Carbine Bolt Tool (don’t try this at home kiddies).

In M1 Carbine Part 5, we removed the components from the stock and receiver that were necessary to remove for inspection and discussed those items not removed.

First I would like to recommend my resource for all the manufacturer information. Craig Riesch’s U.S. M1 Carbines Wartime Production should be considered a must have for anyone interested in the production history of the M1 Carbine. It even includes a handy-dandy fill-in table for documenting all of your component parts to help you compare what you have with what parts are correct for the manufacturer and production dates for your specific rifle. It was very helpful in identifying all the component parts of my rifle. All “type” numbers are as defined in Mr. Reisch’s book.

My rifle really isn’t bad for a “mix master” that spent a number of years in a foreign military. It only has three obvious post-war replacement parts:

The Rear Sight is a type III which is correct for the period of manufacture. It is marked I.R. Co which could indicate WWII manufacture, but it also stamped with the part number 7160060 which is a clear indication that this was a post war replacement.

The type IV safety is also a post war replacement. It should be marked either EI or HI if it were an original WWII Inland piece.

The final post-war replacement piece is the recoil plate. I didn’t take a close up of it because it is unmarked. It is a type III which is the correct style, but all WWII manufacture type III recoil plates bore manufacturer marks. A type III with no markings is post-war.

In addition to the three post-war replacement parts, the stock and a few of the other component parts are from manufacturers other than Inland.

The stock was very hard to identify. It is an oval cut, low wood stock, (not a pot-belly) and has no discernible ordnance markings. It does have the Italian “FAT” emblem.

There are three numbers stamped on one side and the letter “C” stamped on the other. I would imagine that these were some sort of unit markings or inventory numbers.

I could barely make out the manufacturer’s mark in the sling well. It is marked “M-U” which identifies it as an Underwood manufactured stock. It is very hard to see, I must have taken 30 pictures of it from different angles and with different lighting before I got a shot where I could actually read the letters.

The round, type III bolt is marked “EM-Q” on the lug which indicates that it was manufactured by Quality Hardware.

The type V trigger housing is marked S’G’ and was produced by the Grand Rapids Michigan located Saginaw Steering Gear Division of General Motors.

The type II trigger is marked “LT-Q” and so was manufactured by Quality Hardware.

The final non-Inland part is the type III hammer which is marked with a “B/R” inside a box indicating that it was manufactured by Rock-Ola.

The only other questionable part is the barrel band/bayonet lug. Very few M1 carbines were produced during the war with the type III barrel band that included the bayonet lug. Most of them were retrofitted with type III bands after the war. In this rifle’s case it was produced late enough in the war that it may very well have been originally produced with the type III band and the installed barrel band is correctly marked for WWII Inland production. In other words, there is a chance that the barrel band is correct, but it is not a given.

All other component parts have Inland manufacturer markings and are correct for a manufacture date around September 1944.

Anyone have any Inland parts they want to trade for other manufacturers?

Really though, I’d like to replace the post-war parts, but I’m not in the least disappointed with having some parts from other manufacturers on the rifle. I don’t expect this to ever be a collector’s piece so just having period correct WWII manufacture parts on it is authentic enough for me.

In the next episode of M1 Carbine follies, we’re going to reassemble the trigger housing group. I’m still really busy but I’m finding my motivation again so hopefully it won’t be so long between posts from here on out.


49 thoughts on “M1 Carbine Part 6: Component markings and manufacturers

  1. Pingback: M1 Carbine Part 12: The infamous sling and sling oiler | Captain of a Crew of One

  2. Pingback: M1 Carbine Part 9: Major group reassembly | Captain of a Crew of One

  3. Pingback: M1 Carbine Part 7: Trigger Housing reassembly | Captain of a Crew of One

  4. I inherited an M1 Carbine from my dad with some marking I don’t recognize. The only name on the receiver is “Alpine” On the magazine release, it has a “M” stamp and “wa” on top of it.

    Could you give me any guidance on the history of my carbine?

  5. i to have 2 stocks with the fat 82 on it and am at a loss but the wa stands for winchester arms if im not mistaken i have an all original winchester m1 and has the same markings the m i beleive is a proof mark

      • I have a Winchester #1198*** import stamp of
        BLUE SKY / ARLINGTON VA on the original Winchester barrel, long skirt. Is there any reason to find another barrel without an import stamp? Is the lever safety original? The stock has the “I” cut out for the oilier and spacing for the M2 selector lever,is this correct? The rear sight is a Type II, should I worry about that?

  6. I have a M1 Carbine marked Inland on the receiver, but with a Saginaw serial number. It also has Inland GM 8-43 on the barrel. Can anyone explain this.

  7. I have a M1 carbine with a letter I first then rest is covered by rear sight except last two letterw which are R. P. Any ideas who I mfg is?


  8. I have a M1 Carbine that has N.O.I. under the rear sight and 1032 just aft of that. I have been asking around recently and no one has yet to I.D. the manufacturer, I am inclined to think Nat. Ord. Inc, but it doesn’t match the rest of the stampings I am finding online. Thanks.

  9. That’s an Italian Armory Marking. It stands for Fabbrica Armi Terni and the number is the year it was re-arsinaled. Many of those M1 Carbines were loaned to Italy and other countries after the war. They kept them for decades but when they decided they didn’t need them any more, were required to return them to the US. Most of them went to the CMP and were sold to the public through their sales program….which is how I got mine.

    Some people don’t like those markings because they are post WWII, but I think they just add to the rich history of these great little rifles.

  10. Many parts on an M1 Carbine were made by many other companies. A correct, as built, M1 Carbine could be made by Inland with parts from other suppliers. All 10 manufacturers swapped parts as needed in order to get the guns built.

    To answer Dan’s question, RP is Rock-Ola.

    My Inland M1 Inland. Carbine has a Rock-Ola front sight. It also has a Type 3 barrel band that came from Inland. It is a mid 1944 product and yes, it could be factory correct.

    Jay Stang’s Alpine is a post WW II / Korea gun. Alpine made them in CA from 1962 to 1965. Prior to that, Alpine made them under the National Ordnance name. Alpine Sales was basically the sales division of National Ordnance until the two companies split in the fall of 1962. It is a civilian M1 carbine.

    • Your welcome, but I misread Dan’s question. RP on the front sight would be Rock-Ola. RP. under the rear sight as the last two letters would indeed be IBM CORP.

      For Don’s question on the Saginaw SG number on an Inland receiver. It might be a receiver made by Saginaw SG that got numbered by them in error. Or even a replacement unit for a defective and destroyed Saginaw SG unit but it then normally would have an X as the last mark in the serial number. Saginaw SG did make receivers for Inland at a couple points. Don should check for SI or SG marked on the left side of the receiver. Inland MFG DIV of GM was the leading maker of M1 Carbines during the war and had to use parts from many others during the war to turn out their total of 2,632,097 guns. GM made over half of all of them made during the war when you add IMD, SSG Saginaw, and SSG Grand Rapids together. Winchester may have designed them but only made a third of what Inland made.

  11. I need help with barrel markings on a Postal meter Carbine. It has an UNDERWOOD barrel, however the N is backward. The date marking is of a different font and appears to be hand stamped and not rolled. It has a normal Ordnance Bomb.I have never seen this nor can I find any reference to this, I assume error. The barrel appears to be usgi and correct to the receiver. Can you help.

  12. I recently purchased what I think is a WW II manufactured M1 carbine. It his is my first such purchase, so I am new at this. My M1 is a Standard Products rifle, serial no. shows manufactured between Oct-Dec of 1943. The barrel is an Underwood dated 11-43 and the stock is Hillerich Bradsby. It has a rearmory marked BA with post war type IV rear sight, modified Mag release and upgraded flip safety. It has an early type one barrel band. I do not know whether to restore it or leave it as is? Any thoughts?

  13. I have an M1 carbine serial numbered XB32 on the receiver. It has a barrel marking “Inland Mfg. Div.” over “General Motors” over “1/44”.

    Any ideas on the strange serial number?

  14. Nope. If I were to guess I’d say the receiver is aftermarket. The serial numbers for original receivers were pretty straightforward.

    No guarantees though…I’m no historian when it comes to this stuff…just a hobbyist. Its possiblenyou’ve got something rare there. I just don’t know.

  15. I just bought my first M1 Carbine and it does not have that many markings/stamps so I wonder about it’s origin. So here we go:

    Inland 6 digit s/n 248— under rear adjustable sight
    Only marks on barrel seem to be the Inland hyro on underside closer to the receiver. No other marks at all.
    US Carbine CAL. 30 M1 on top of receiver over chamber area
    Rear adjust. sight is marked- IRCO
    Mag release marked-M
    Bayo barrel wrap-JMO
    Bottom of bayo lug-EMO
    Cocking handle-B
    Round slide in/out safety
    Flat Smooth butt plate.
    No marks on trigger group??
    Stock has light remains of a crossed symbol and a 10 in sling cutout on left side of stock.

    Any help will be appreciated!

  16. Have 6 digit serial number inland div and underwood barrel dated 9-43 with flaming bomb, also on barrel is Excel / Gardner Ma.
    Can not find information on this , assume it to be a rebuild all other parts matching.

    Thanks Robert

  17. I have a M1 carbine I bought in 1959 for $50.00 at a dept store. I can’t seem to read the markings under the rear sight and I don’t how to disasemble the rear sight. The markings that appear an the side of the rear sight read “JAO ” PLEASE ADVISE,

    Tom Amico

    • The rear sight is just dovetailed on so you should be able to drive it off with a brass drift. The JAO on the rear sight indicates it was manufactured by Inland, but that doesn’t mean the receiver or other parts were as well. many of these rifles were rearsenaled at various times during their lifespan and were reassembled with mismatched parts.

  18. A lot of people asking me for information on their rifles. I’m not an expert, I’m just a guy who got a rifle from CMP and did research on my rifle’s markings.

    I wish I had time to research everyone else’s rifles, but I just don’t. Sorry. The original post contains a link to a very good book on the history and manufacture of the M1 Carbine…that was my starting place. I would recommend buying that book and using it as a springboard for researching the markings you find.

    Another excellent resource is this web site.

  19. Your receiver is not only original, but special. I have recently seen 3 examples with such s/n’s, It is likely an Inland, and was serialized that way in a presentation run. They were given to plant officials, important local people, etc, by the factory as gifts. The generally did not see war. Do some googling on presentation run carbines.

  20. I have an M1 carbine serial number 2459528 and it has a letter W in a circle below it all behind the rear sight.

    on top of the barrel is the letter U and it’s top faces left, foreward of this marking about 2″ is what looks like a bomb and above it to the right is the number 13, above this the letters are hard to read but I get (Jnul wood)

    The foreward barrel band has on the left side a diamond with what looks like an O.
    The left side of the rear sight has the letters SA
    I see no stock markings,the finish has a very dark Patina

    just before the front sight blade is a letter U and the top of the U faces rearward.
    Any help idendifying this M1 would be appriceated.

  21. I found a few of my own questions in my post dated 1/31/16

    I believe the markings (U) on the barrel and front sight (type 1) to be Underwood,their production numbers match the serial number range my gun falls into.
    The marking on the RIGHT side of the rear sight (SA) is a puzzle,the S would be Underwood but the A does not show for an Underwood,I still need info on this.

    I think the markings in the barrel are June 13, Underwood with the flaming bomb.

    The recoil plate is marked with a W in a circle and I think this might be Winchester.

    The safety,butplate & screw are unmarked,typical of Underwood.

    The bolt top is flat,WW11 I think.

    The serial number date range J/43 – M/44

  22. More info on my M1
    rear site right side (SA) marking, (Security assistance) European theatre?
    reciver serial # 2459528 marked (w) in a circle, if Winchester why is it not on the list?
    barrel band marking (0) in a diamond. I can find no reference to this marking.
    stock marked (TRIMBLE TN) this is either NPM or SGS.

  23. hi,i have a rockola 1st block 1729xxx i cut stock high wood ,all parts marked rockola,br,mr,fr and flaming bomb on side of barrell,any thoughts

  24. I found out that the XB32 serial number on my Inland Division of GM carbine indicated that it was a presentation carbine. It could have been given to an important political person or business person when they visited the factory since there is no plaque on its stock. There were several similarly marked carbines that were produced with this style of serial number indicating they were presentation pieces.

  25. Do all Winchester M1 carbines have a “WP” circled proof mark on the barrel, instead of just the “P”?

  26. Hi there, I have just bought an M1 Carbine and it has a random stamp “HE-B” just behind the real serial number. Any ideas?? It is a General Motors 8-44 model….


  27. Hello, just purchased Underwood 3/43 has correct s/n for that period And 2 stamps on the stock that i’m not what they mean . The letter “P” on the grip and 3 letters stamped “AAW” on the left side of the stock above the trigger. Any input is appreciated, thanks

  28. Pingback: So I picked up a M1 carbine for 700.00

  29. I have a strange M-1 carbine, Winchester. The metal is like new and correct, as far as I can determine. The stock is the weird thing! It has black repair pins, look like wood, and are installed at all of the normal stress points.. There are 6 black wooden pins in it. They are about 6 mm across them. Then the receiver serial number is stamped into the sling slot of the stock. They both end in 7018 and the stock is ID’d as IO, Inland. The stock is an “I” stock. The gun is in very good condition and have a very shiny surface. Can you tell me what it is and is it of any value other being a shooter….. Thank you!

  30. I have a September 1943 Quality Hardware receiver and an Inland December 1943 barrel. Is it likely they they are both original to the gun even with the 3 months difference in their production dates?

  31. Have a Saginaw S”G” that has HQ155 stamped marking on the base of the hand grip and an “8” stamped just behind the recoil plate on top. Would this be a unit number and weapon rack number???
    This M1 was produced with an Underwood barrel dated 8-43.

  32. I’ve been researching the manufacturer of my Carbine magazines and have tracked them all down but one. I’ve identified Union Hardware, Inland Division, and International Silver, but I have one marked CB that I can’t find on any of the manufacture lists that I’ve seen. Does anyone know what company made CB?

    Also, I have 5 magazines still wrapped in their original cosmolene (?). I can’t tell you how tempted I am to unwrap them to see who made them!

    Thank you for the asset,


  33. I have a carbine that has an operating lever without a button. In order to hold the bolt back I discovered that if you pull the lever to the rear and lift up it latches in a cutout inthe receiver is this a variation?

  34. So, after 14 years this post is still getting comments, mainly people asking questions about their carbine markings.

    I’m going to repeat what I said in a comment above some 6 years ago:

    A lot of people asking me for information on their rifles. I’m not an expert, I’m just a guy who got a rifle from CMP and did research on my rifle’s markings.

    I wish I had time to research everyone else’s rifles, but I just don’t. Sorry. The original post contains a link to a very good book on the history and manufacture of the M1 Carbine…that was my starting place. I would recommend buying that book and using it as a springboard for researching the markings you find.

    Another excellent resource is this web site.

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