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FEATURED CARBINE: IBM 3937627

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Joined: Jan 01 2016
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Post Options Post Options   Thanks (0) Thanks(0)   Quote m1a1fan Quote  Post ReplyReply Direct Link To This Post Posted: Mar 12 2017 at 5:34pm
Fantastic example of a late IBM.  Great pictures of the parts especially those which are blued.  Did not realize the barrel crown shape changed as manufacturing progressed.  This article also pointed me to a few CCNL's about IBM's which I've missed.  Very informative.  Thanks!
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Post Options Post Options   Thanks (4) Thanks(4)   Quote Newsman2 Quote  Post ReplyReply Direct Link To This Post Posted: Mar 11 2017 at 10:42pm

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March 2017-A

International Business Machine (I.B.M.) Serial Number 3937627

 

This IBM was a DCM gun originally purchased from the LetterKenny Army Depot in Chambersburg, Pa. The receipt is shown below and yes, it was sold for $20.


 



The oval cut stock is marked LW-B (Lumb Woodworking Co Inc. of Poughkeepsie, NY) in the sling well with the expected cartouche.


View of the barreled action including the trigger housing and slide. Note the 26 ½ coil hammer spring used in all I.B.M. carbines.


 

The type 1 rear sight is marked GE-Q and S on the other side (the leaf is unmarked). GE-Q sights were made by Gerrand Co. of Chicago Illinois for Quality Hardware. They have been reported on other IBM carbines but no documentation exist of a lateral transfer between Quality Hardware and IBM. The rear sight staking and sight pin staking is also shown.



Below is an overhead view of the rear sight. Note the different types of dovetail staking on the left and right side.


The receiver ring marked U.S CARBINE CAL. .30 MI as shown below. Note the single staking on the gas piston screw.

 

 

A close up of the wrist (marked with W) and stock nose. Numerous original appearing, late IBM carbines were reported with a single letter stamped on the wrist. See CCNL 345 for for more information. The reason for the letters is unknown. Could they be inspector marks? Perhaps they are inspector marks from the LetterKenny or other depots? More information is needed. Collectors, please report your IBM carbines to the club. The type 2 band has four weld scars. The P proof mark is also shown; note how close it is to the nose of the stock.

The recoil plate is marked PR-B (Parker Manufacturing Co. of Worcester Ma.) and is common on original carbines. The recoil plate screw is of the late type.


 

The handguard is also marked LW-B (Lumb Woodworking Co Inc. of Poughkeepsie, NY). The oiler is marked IS for International Silver.


 

Note the increased dwell on the AOB (Auto Ordnance of Bridgeport, Conn.) marked slide (see CCNL 363). It appears many late IBM carbines have slides with increased dwell, but no 7160091 number stamp. Also note the double stamps slide, in this case stamped EE. Could double stamped slides denote increased dwell?  More research is needed.


The trigger housing is marked BE-B on the right side and is of the braised type.


The trigger housing contains the following parts: Sear marked SW-B (Star Watch Case Co. of Ludington, Mich.), magazine catch marked PR-B (Parker Mfg. Co. - Parker Wire Goods Co. of Worcester, Mass.)safety marked EPB (Eaton Pond Co. of Springfield, Mass.),Trigger marked PD B (Paradise Mach. Co. of West New York, NJ) and the hammer is marked AMB (Art Metal Works of Newark, N.J.).



The round bolt is marked AOB (Auto Ordnance of Bridgepost, Conn.) upside down on the right lug and an H is stamped on the left.  Note the type 3 firing pin and extractor.


Top view and close up of trigger housing including single hammer strike mark and type 2 sear marked SW-B (Star Watch Case Co. of Ludington, Mich.).


IBM Barrel Proof Mark

A close up view of the IBM Barrel Proof mark. It appears to be sideways. If others have serial numbers in this range, please report the orientation of the P mark.


 

Multiple views of the I.B.M. SI B (Simpro Mfg. Co. of Newark N.J.) front sight and undated I.B.M. Corp barrel.  Undated barrels have been reported in the 3.79-3.96 range. Note the front sight key retention is held in place by the milled notch also called the "hacksaw" cut. The barrel crown is of the rounded type. Sometime during production, the way barrel crowns were finished changed. Early barrel have a flat crown, later ones rounded (CCNL 345).




Side views of the SI B front sight.  Note the bluing and indentations on either side of the pin.



The type 2 barrel band has a single slash \ mark. Type 2 barrel bands on IBM's have been reported as unmarked, /, \ and //.  Close up of the 4 weld scars type 2 barrel band.



The butt plate is also shown. Two type of butt plates have been observed, type A (CCNL 329-4) and type B (CCNL 94-5). This butt plate is the type A "step" pattern.

Data Sheet


Thanks to owner of this fine example of a late IBM carbine, Steve Manning.

Newsman2

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