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IBM Markings

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painter777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote painter777 Quote  Post ReplyReply Direct Link To This Post Topic: IBM Markings
    Posted: Oct 27 2020 at 6:29pm
Seen this on GB today. IBM 3,709,586
IBM Barrel markings look like a mess.
After seeing the Barrel markings...
And Especially what appears to be the turned down area / diameter on the barrel to the rearward position of the Frt sight.
Picture makes it Appear the the Frt sight is all the way back, but looking at another picture from a distance you'll see it isn't. Is it just me ? Or is it the pictures that make the Frt sight look as though it's the correct diameter to the rear of the Frt sight and keyway, BUT then steps up to a bigger diameter, before getting to the full diameter of the barrel. 
Is this a real IBM barrel with just another Messy stamping job like seen on others.
I see no markings on the barrel flat.

IBM Corp M1 Carbine with Original Carry Case plus Mags-img-54
IBM Corp M1 Carbine with Original Carry Case plus Mags-img-55

Is the muzzle end milled to 2 different diameters before getting to the full barrel diameter?
It appears the forward area that the Frt sight and keyway are on is a smaller diameter than directly behind them. 
IBM Corp M1 Carbine with Original Carry Case plus Mags-img-56

IBM Corp M1 Carbine with Original Carry Case plus Mags-img-13
P stamped ahead of the added Bayo band

IBM Corp M1 Carbine with Original Carry Case plus Mags-img-53

Also noticed and wanted to ask if it's common to see a letter marking here on a IBM ?

IBM Corp M1 Carbine with Original Carry Case plus Mags-img-57

Gas Cylinder
IBM Corp M1 Carbine with Original Carry Case plus Mags-img-40

1- Is the Barrel real ?
2- Is the front of the barrel 2 different diameters ? Before getting far enough back to the full diameter barrel.
3- Is the letter marking on the receiver cross bridge common on IBM's ?

Hope you can follow my screwed up descriptions, I'd give a $100 to put a Mic on this barrel front.

Ch-P777
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jackp1028 View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote jackp1028 Quote  Post ReplyReply Direct Link To This Post Posted: Oct 27 2020 at 7:02pm
Pic #3 looks like the barrel band is slid up against the front sight. Barrel looks okay to me.
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hunterman View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote hunterman Quote  Post ReplyReply Direct Link To This Post Posted: Oct 27 2020 at 7:14pm
I agree with jackp1028, the barrel band is up against the front sight in photo 3.  Looks fine in photo #4.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote W5USMC Quote  Post ReplyReply Direct Link To This Post Posted: Oct 27 2020 at 7:43pm
Yep, JackP is on to something, here is the sideview.


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painter777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote painter777 Quote  Post ReplyReply Direct Link To This Post Posted: Oct 27 2020 at 8:55pm
Picture shows a slight recess between the rear of the Frt sight and the ridge just touching the lead key. 
At this point you can see the OD of the Frt sight (ring) looks equal OD to the Ridge touching the lead key. You could lay a straight edge on it at this point.
Then the ridge that's touching the lead key travels back to the rear ridge where the barrel becomes the full diameter size.

Have you ever installed a Frt sight back far enough to touch this ridge ?

I understand a Bayo band would slide forward to the back of the Frt sight.

IBM Corp M1 Carbine with Original Carry Case plus Mags-img-56

Picture from M1A1fan,

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Post Options Post Options   Thanks (1) Thanks(1)   Quote New2brass Quote  Post ReplyReply Direct Link To This Post Posted: Oct 27 2020 at 9:16pm

I think you are seeing the IBM barrel notch
Take a look at the datasheet


http://www.uscarbinecal30.com/forum/uploads/10/DSBarrel.jpg


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painter777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote painter777 Quote  Post ReplyReply Direct Link To This Post Posted: Oct 27 2020 at 9:47pm
Let me put it like this...
In this picture:
Does the Barrel in front of the Sight looks the same OD as behind the sight ?

IBM Corp M1 Carbine with Original Carry Case plus Mags-img-56
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painter777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote painter777 Quote  Post ReplyReply Direct Link To This Post Posted: Oct 27 2020 at 10:03pm
Jeeze,
I'm an Idiot.
You guys spelled it out but I was convinced It was something different.
It just now dawned on me what you were telling me:

The Type III Bayo Band is slid forward against the Frt Sight, Then the Picture was taken !!!
I'm here thinking Surely these guys can see that the barrel is less OD in Frt of the Sight and Larger OD in back.

What can I say ? Ouch
That's what I deserve for picking out problem carbines all day on the auctions.

Appreciate the helpful insight gentlemen even if it took most of my evening trying to point out something that wasn't there. Your a good bunch !

Ch-P777
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1989LX View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote 1989LX Quote  Post ReplyReply Direct Link To This Post Posted: Oct 28 2020 at 1:14pm
Hey, it happens. I wouldn't sweat it too much.
USGI magazines are like potato chips, you can't have just one!
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painter777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote painter777 Quote  Post ReplyReply Direct Link To This Post Posted: Oct 28 2020 at 7:40pm
Thx 1989LX,
I'm still curious as to the Nasty Stamping job on that barrel.

Ch-P777
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1989LX View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1989LX Quote  Post ReplyReply Direct Link To This Post Posted: Oct 29 2020 at 2:31pm
Truth be told, I wonder what is up with that too. Even though I've only been on the mortal plane 21 years and been into carbines since I was probably 5 or 6, I've never seen that crude or messy, whichever word you want to use of a stamping job on a barrel personally.
USGI magazines are like potato chips, you can't have just one!
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