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Posted: 10/14/2010 12:53:29 PM EDT
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Hey guys,
Me and a buddy are wanting to tackle a reweld job on some M70/M64 demilled recievers (I am knowledgable about MG laws etc, these will be done as "new semi-auto only" builds per ATF and will be done correctly..these ARE NOT MGs...please no flaming about "building an MG"....I have done PLENTY of AKs). What I am wanting to know is has anyone done a reweld job or know of any tutorials about using the original reciever stubs instead of the reweld plates? I'd like to see how these look and the level of diffuculty between this and using a new repair section. Thanks |
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I responded to the IM that you had sent me.
I took a few pics so you could see what you are up against. Here is the jig that I made out of brass. Gives me a solid clamping surface on two sides at a perfect 90 deg. I also set up the front and rear stops so that you get the correct length. 
Here is the receiver I welded up. I welded the whole thing even though I knew I would be cutting the front and rear off of it. Mainly because this is my first AK build and I just want the practice. First thing I did was fill the extra 3rd hole that would make it a MG. This picture is after I cut the front and rear back off. I had hoped it would be easier to clean up the welds on the inside. It is a pain in the ass. 
This picture shows the M70 kit before I have demilled it. I wanted to get the center receiver section done first. 
Here are pictures of a second receiver I bought just in case I fubared the first one. Shows you how bad it really is. There is a lot of material that is missing that needs welded back in. I did a few tacks at a time to keep the heat down. The whole receiver still shrunk about 1/16 inch in length from the welding. 
Hopefully this project will be back at the top of my list soon so I can get it done. I have a 64 that I will be doing after this one if it turns out. Hope this helps Justin |
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This thread might help you out also
http://www.ar15.com/forums/topic.html?b=4&f=51&t=128854 jdb3 is a wealth of knowledge in this area also. Last I had talked to him he had a few center sections made up. |
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It can be done with the demilled sections. Takes patience and more clean up than other methods because you have more welds.
I make and use plates because I have a mill. I tried a couple demilled receivers but didn't like the results (well, the process of getting good results). I didn't like the demilled sections because I had more gaps to fill. The center has to be welded back together then joined with the stubs. This leaves more gaps to fill and that means more welding. More welding means more shrinking and pulling/warping. Fighting the pulling/shrinking while trying to keep the FCG holes lined up, OAL correct and ejector position. The plates allow me to fit them to the front and rear stubs with no gap. Then I place everything where I want it. Much less clean up than trying to fill gaps from the torch cuts. I could have made a jig to do the others but there still would be more clean up and you can't prevent all of the distortion that would effect critical areas. It can be done with those sections, if you can weld, metal can always be fixed. Those will take more effort to clean up internally and possibly welding up and redrilling holes if you get too much distortion. But with effort and patience, they will work. At the end of the day, you're welding a gun back together, you have to expect some work. 
I've done my share of these and make the plates for different types, have several functioning rewelds and some long sections of demilled scraps for dimensions. If you have any questions on dimensions, just PM me and I'll help as best as I can. |
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