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  #1  
Old 01-22-2022, 07:59 PM
Gunny TNT Gunny TNT is offline
 
Join Date: Feb 2021
Location: Long Island NY
Posts: 72
Default M1 Garand with CAI receiver

Iíve been a member of these forums just under a year.
I purchased two SA M1 Garands in this time frame shot and cleaned them multiple times to learn as much as I could
I read a lot from books and your forums post daily.
I feel I know enough to be dangerous.
My older brother who has owns a M1 for 10 years asked me to look at his because the last time he fired it it didnít cycle correctly.
I noticed it was a CAI receiver which I heard of but never seen.
It had a Danish mark barrel and some not all SA USGI parts
I was thinking his op rod or gas cylinder wear could be the issue but when he dropped it off today I noticed the op rod was out of the receiver channel.
So I disassembled the entire gun cleaned it and reassembled it.
The gun was dry. I told him oil is ok in some places but M1ís like grease.
After reassembled I cycled the action a bunch and it was much better but every once in a while the op rod will pop out of the receiver channel when in the far rear position
Iíve read this is common on these CAI receivers because of poor tolerance.
Iíve also heard these receivers are dangerous.
What would you recommend other then throwing it in the garbage

Thanks
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  #2  
Old 01-22-2022, 09:54 PM
Bml Bml is offline
 
Join Date: Mar 2019
Location: Oregon
Posts: 412
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Even though they are not popular with collectors, they are relatively valuable.

Check the op rod tab for wear and check the receiver track dimensions. Also check to ensure the rod is not bent worsening the problem. There is things that can be done depending where the problem is.

I would have it fixed, sell it and buy a usgi.
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  #3  
Old 01-23-2022, 05:14 AM
1563621 1563621 is online now
 
Join Date: Oct 2009
Location: New Jersey
Posts: 4,048
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Or look for a new receiver. Switch oprod to a good rifle to see if oprod is the problem. But, I think it is the receiver.
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  #4  
Old 01-23-2022, 06:02 AM
Gunny TNT Gunny TNT is offline
 
Join Date: Feb 2021
Location: Long Island NY
Posts: 72
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Quote:
Originally Posted by Bml View Post
Even though they are not popular with collectors, they are relatively valuable.

Check the op rod tab for wear and check the receiver track dimensions. Also check to ensure the rod is not bent worsening the problem. There is things that can be done depending where the problem is.

I would have it fixed, sell it and buy a usgi.
Great ideas but with all of the books I read I havenít seen anything giving correct dimensions of the receiver track or op rod tab toleranceís.
Does anyone have these available or recommend where to find?
Thanks for the feedback
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  #5  
Old 01-23-2022, 07:32 AM
M1Garandy M1Garandy is offline
 
Join Date: Dec 2011
Location: IL
Posts: 1,111
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Have you looked at Jerry Kuhnhausens, .30 Gas Operated Service Rifles book?
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  #6  
Old 01-23-2022, 09:07 AM
Gunny TNT Gunny TNT is offline
 
Join Date: Feb 2021
Location: Long Island NY
Posts: 72
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Quote:
Originally Posted by M1Garandy View Post
Have you looked at Jerry Kuhnhausens, .30 Gas Operated Service Rifles book?
I have not if that has the dimensions Iíll buy it itís only $55 on Amazon
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  #7  
Old 01-23-2022, 10:08 AM
McLovin McLovin is offline
 
Join Date: Nov 2009
Location: SW Ohio
Posts: 183
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Place your brothers op rod on one of your Garands and fire off a clip, put your op rod on your brothers Garand and fire off a clip if the op rod jumps out of your brothers Garand, then it is the receiver if it jumps on yours, then it is the op rod.
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  #8  
Old 01-23-2022, 10:14 AM
78jeep 78jeep is offline
 
Join Date: Oct 2009
Location: north carolina
Posts: 1,676
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yes thats the book you need. page 121. op-rod tab .320 (.317 min. ) high. .100 (.095 min. ) wide. if its out of spec. these guys can fix it.


http://www.columbusmachine.com/oprod.htm
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  #9  
Old 01-23-2022, 06:45 PM
yooper yooper is offline
 
Join Date: Oct 2009
Location: Yooperland, USA
Posts: 264
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Quote:
Originally Posted by Bml View Post
Check the op rod tab for wear and check the receiver track dimensions. Also check to ensure the rod is not bent worsening the problem. There is things that can be done depending where the problem is.

The operating rod is supposed to be bent; see Kuhnhausen's book. The question is, is it bent out of spec? The link 78Jeep provided can check and fix that as well.
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  #10  
Old 01-30-2022, 01:53 PM
Gunny TNT Gunny TNT is offline
 
Join Date: Feb 2021
Location: Long Island NY
Posts: 72
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FYI

Update I purchased the shop manual by Jerry Kuhnhausen.
Great book of information.
Thanks to all the suppling information including glindes for the emails
The op rod receiver guide stud is out of tolerance measuring .315
I greased everything and the receiver slot seems low as CAI receiver tolerances arenít that good as Iím finding out.
My next step is shooting it but living on LI New York that takes time.
If fails again Iíll probably send out to the link above or purchase a op rod

Thanks to All for your knowledge & support
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