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M1 carbine reciever leg

Printed From: The Carbine Collector's Club
Category: The Club
Forum Name: Safety/ Accuracy/Shooting/Ammunition/Care and Maintenance
Forum Description: What to Check, Reloading, Tips for Accuracy, Competitive/Recreational Shooting
URL: http://www.uscarbinecal30.com/forum/forum_posts.asp?TID=3051
Printed Date: Mar 29 2024 at 2:37am
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Topic: M1 carbine reciever leg
Posted By: Stewman
Subject: M1 carbine reciever leg
Date Posted: Aug 04 2017 at 4:40am
New to the forum with a question. Bought this standard products a couple years ago and just now noticed that one of the legs had been broken and rewelded back on. Should I fix it better? Leave it alone? Or replace the reciever?

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Replies:
Posted By: Ghostman
Date Posted: Aug 04 2017 at 5:08am
It actually doesn't look to bad, maybe reparkerize. I'm no Engineer, but all that part of the receiver does is hold the trigger assembly on. No danger of it exploding in your face or other safety issues that I could foresee! It's the opposite end of where the pressure could work on it! I'd leave it alone and enjoy the carbine!


Posted By: sling00
Date Posted: Aug 04 2017 at 6:31am
First...Welcome to the forum!  I found in Kuhnhausen's Shop Manual, pg 84 it discusses broken lugs were probably caused by trying to bend the lug or dropping the receiver on a concrete floor.  He has a note regarding successfully repaired rear lugs.  (1) Preheat receiver to 400F, (2) TIG weld filling areas with 4130 rod, (3) remachine areas.  It also states without reheat treating weld transitions and fill areas typically remain after reparkerizing.  It's kind of early in the morning, but if I have this pictured in my mind correctly, the only forces I can think of on the lug are when the bolt retracts and is cocking the hammer.  Once cocked, there is no force other than the weight of the trigger housing assembly. 

Based on my simplified thoughts, I tend to agree with Ghostman to leave it alone and have fun. There are other forum members with metal working skills who can really help out on this question.  

Thanks for asking and I look forward to seeing the replies.


Posted By: manteo97
Date Posted: Aug 08 2017 at 3:30pm
I have welded a front tang back on a receiver (flux core with preheat), with no detrimental results. Tang was broken off when a "gunsmith" tried to remove a barrel. I also have a receiver with the front tang brazed back on. No loss of hardness in the receiver ring area. Again, no real problem.

Welding of any kind should not be attempted in trying to put a torch/saw cut receiver back together (ie a re-weld), or a cracked receiver ring (due to over-tightening a barrel).

Stewman, you are probably just fine with this repair on the leg here. It's not a TIG weld (preferred), and not an attractive weld, but functional consider the area it's in on the receiver.

Ted


Posted By: floydthecat
Date Posted: Aug 08 2017 at 7:34pm
As Ted would surely know, some of the commercial carbine manufacturers welded gas blocks on barrels and front lugs on receivers. Iver Johnson modified and used thousands of forged steel receivers left-over from the acquisition of Universal. They converted those dual-spring receivers to single-spring receivers by replacing the front lug, which they brazed in place. I have one of those. It's a regular shooter and has not fell-apart....yet.


Posted By: sling00
Date Posted: Aug 09 2017 at 5:53am
Thanks manteo97 for your help.  I was hoping you would see this post.


Posted By: m1a1fan
Date Posted: Aug 10 2017 at 8:08am
Have seen some pretty bad weld jobs on torch cut receivers. Scary bad. Have seen one receiver leg weld job in person but did not get a picture. It was perfect and the person that did it knew what they were doing.


Posted By: sling00
Date Posted: Aug 10 2017 at 9:17am
I was glad to see Kuhnhausen's Shop Manual describe how to repair them.  That's a good thing to know if you ever break one or find a real deal on one with a broke lug. 


Posted By: Stewman
Date Posted: Oct 10 2017 at 3:44am
I decided I would go ahead and repair the not so good looking repair. Tig welded it up and reshaped the leg. And cild blue.

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Posted By: shadycon
Date Posted: Oct 10 2017 at 8:41am
Now that look great! Good job!!

-------------
M1's are FUN!!!
TSMG's are more FUN!!!


Posted By: W5USMC
Date Posted: Oct 10 2017 at 9:34am
Originally posted by Stewman Stewman wrote:

I decided I would go ahead and repair the not so good looking repair. Tig welded it up and reshaped the leg. And cild blue.
Wow, hard to believe that was the same receiver. Really good job.


-------------
Wayne
USMC Retired
NRA Life Member


Posted By: cali201
Date Posted: Oct 10 2017 at 3:42pm
Nice job


Posted By: m1a1fan
Date Posted: Oct 10 2017 at 6:25pm
Spot on....Great job!


Posted By: manteo97
Date Posted: Oct 10 2017 at 10:22pm
Outstanding job! TIG always best way to go, as it keeps heat input into the parent metal to a minimum.

What filler rod (alloy) did you use?


Posted By: Stewman
Date Posted: Oct 11 2017 at 7:55am
Er80-2 for the filler.



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