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Vig to MP40 modification


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#1 RogerD

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Posted 23 June 2020 - 01:26 PM

I have sent a few Vig magazines for modification to a friends machine shop for use in my MP40.  I do not have a spare mag well to make the job easy for him.  Just some general dimensions.  My question is does anyone know how much has to be milled/ground off the 4 sides for a proper fit?  Any input is welcome.


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#2 BillyDixon

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Posted 23 June 2020 - 04:21 PM

my experence has been some vig mags fit righr into mp40 magwell, some way too wide, some mp40 mag wellway too tight, so tolerences all over the place, each vig mag must be fitted to which mag well you have, just sayn


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#3 1gewehr

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Posted 24 June 2020 - 06:42 AM

I just put them to the belt sander.  Sand off to bare metal on all four sides.  Then test fit and sand the shiny spots until I get a snug fit.  Switch to 400 grit and make them smooth.  Then they usually are a nice snug, but smooth fit.  I cheat and cold blue the exposed steel.

 

Careful about taking too much metal off the right side.  I did one that ruined the mag catch hole.

 

If I had to guess, it's probably on the order of 1/32" on each side.  Not very much at all.


Edited by 1gewehr, 24 June 2020 - 09:18 AM.

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#4 Petroleum 1

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Posted 24 June 2020 - 07:46 PM

Gewehr is right on with his instructions. It would be best if you could find a magwell for trial fitting as the material is being removed. They do not all fit the same.
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#5 RogerD

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Posted 29 June 2020 - 11:57 AM

Thank you for input.  The machine shop is 1,100 miles away so there will likely be a few round trips.


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#6 RogerD

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Posted 15 July 2020 - 08:08 AM

I received my two 'test' Vig magazines back from my friends machine shop.  The young man who was assigned the task had only an original mag, your comments, and rectangle dimensions for a trapezoid. I was pleasantly surprised at how well they fit.  Test firing later in the week.  If all goes well we might run off a few dozen.Attached File  84899CF7-3BA5-4F69-8416-5EB71BB4BC64.jpeg   90.11K   5 downloads

Edited by RogerD, 15 July 2020 - 08:13 AM.

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#7 Petroleum 1

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Posted 15 July 2020 - 05:50 PM

Looks good !! I typically put some cold bluing on to make it match the rest of the mag finish. Not necessary just for looks thats all.
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