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  #1  
Old 04-07-2019, 07:20 PM
SirWilliam SirWilliam is offline
 
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Default Mystery MB mark? cmp 1911
Anyone have any insight as to what the MB on the slide and frame signify? Ithaca frame and slide, OB-84 electropencil near the trigger.

https://imgur.com/a/3kC5qcM

Thanks, Bill
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  #2  
Old 04-07-2019, 07:50 PM
thebearpack thebearpack is offline
 
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Hi Bill.
That MB stamp has been observed before but as far as I know there has not been any consensus on its meaning. Still apparently a mystery.
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  #3  
Old 04-07-2019, 07:53 PM
Jakeroub Jakeroub is offline
 
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What does the OB stand for? Overhaul Barstow? Maybe the “B” in “M-B” is for the same?
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  #4  
Old 04-07-2019, 08:01 PM
DDRode DDRode is offline
 
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According to "shooter5" on 1911.COM...

"MB" is a MPI inspection stamp!!!

SEE: https://forums.1911forum.com/showthread.php?t=976754

Another "MB" discussion on GUNBOARDS (with "shooter5" still insisting he knows what he knows)...

SEE: https://forums.gunboards.com/showthr...s-LEAD-arsenal

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Last edited by DDRode; 04-08-2019 at 09:45 AM.
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  #5  
Old 04-07-2019, 10:00 PM
Gewehr43 Gewehr43 is offline
 
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Ok......I guess I'm curious.
If "MB" is for Magnetic Particle inspection, then why isn't it "MP?"
That is how they are marked on USGI M16 barrels and bolts.
So they spelled it correctly on the rifles but not on pistols?????
I can see it's some sort of inspection mark but not that.

BTW..... both those links end up having the same source (Shooter5) giving his thoughts.
I understand his point but, again, his thoughts were this (the MB marking) may have been done in the 70-80's.
The M16's in the 60's were marked "MP" so if it's the same..... why would it change for the 1911?
Again.... just my WAG but I don't think it's Magnetic Particle inspection.
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Last edited by Gewehr43; 04-07-2019 at 10:23 PM.
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  #6  
Old 04-08-2019, 08:25 AM
thebearpack thebearpack is offline
 
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Quote:
Originally Posted by Gewehr43 View Post
BTW..... both those links end up having the same source (Shooter5) giving his thoughts. I understand his point but, again, his thoughts were this (the MB marking) may have been done in the 70-80's.

Again.... just my WAG but I don't think it's Magnetic Particle inspection.
I agree. It certainly could be the case but one person's anecdote doesn't prove anything.
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  #7  
Old 04-08-2019, 09:28 AM
DDRode DDRode is offline
 
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Quote:
Originally Posted by thebearpack View Post
I agree. It certainly could be the case but one person's anecdote doesn't prove anything.
I provided those links just for the hell of it!!!

CUZ...



ACTUALLY...

I kinda think it stands for either MEGABYTE or MILTON BRADLEY!!!

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Last edited by DDRode; 04-08-2019 at 10:15 AM.
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  #8  
Old 04-08-2019, 10:52 AM
thebearpack thebearpack is offline
 
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Quote:
Originally Posted by DDRode View Post
I provided those links just for the hell of it!!!

CUZ...



ACTUALLY...

I kinda think it stands for either MEGABYTE or MILTON BRADLEY!!!
LOL, not saying you're wrong! Just saying I'd like to see more evidence before I'll buy it 100%. It could well be a testing mark.
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  #9  
Old 04-08-2019, 11:13 AM
Twinson Twinson is offline
 
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Match Built??? MB
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  #10  
Old 04-09-2019, 07:06 AM
tazaroo tazaroo is offline
 
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MB if stamped on a Colt barrel stands for "Match Barrel".
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