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Who knows how to fix Thompson feed lips? Seems like a shame to throw it away.


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23 hours ago, Doug Quaid said:

thanks

looks like everyone is happy with the Tiz tool.

I'll PM him.

I have the tool ... the only problem I have with it is the requirement to ream out the magazine catch hole on some magazines in order to insert and tighten the bolt that holds the tool in place in the magazine. This makes me uncomfortable, but of course if the magazine is not working, anything is worth a try.  I prefer disassembling old USGI magazines, cleaning them up, adding some protective lube, reassembling - then using a micrometer to compare the lip spacing against magazines that I know work in my particular gun. If out of specs, I'll use a magazine lip tool to bend and adjust them to match the measurements on my good magazines until I can get them to function properly.

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On 9/18/2023 at 1:21 PM, katanafred said:

I have the tool ... the only problem I have with it is the requirement to ream out the magazine catch hole on some magazines in order to insert and tighten the bolt that holds the tool in place in the magazine. This makes me uncomfortable, but of course if the magazine is not working, anything is worth a try.  I prefer disassembling old USGI magazines, cleaning them up, adding some protective lube, reassembling - then using a micrometer to compare the lip spacing against magazines that I know work in my particular gun. If out of specs, I'll use a magazine lip tool to bend and adjust them to match the measurements on my good magazines until I can get them to function properly.

Just a note of clarification on the use of the Magazine feed lip repair  tool. The included instructions clearly state that if the alignment bolt will not fit it is because the inside folds of the spine of the magazine are interfering, in which case a 5/16 inch reamer will provide the necessary clearance to insert the alignment bolt. Not all magazines may require this step, some mags will have sufficient clearance and will not require a reamer to be used. In any case the magazine catch hole is NOT enlarged in any way. The magazine catch hole is 11/32 so the 5/16 reamer will ONLY provide the necessary clearance to the inside folds of the mag spine. The mag catch hole will not be enlarged or altered in any way.

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On 9/20/2023 at 8:55 AM, Tiz said:

Just a note of clarification on the use of the Magazine feed lip repair 

 

-snip-

 

The mag catch hole will not be enlarged or altered in any way.

Huh, I was wondering about that. 

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On 9/18/2023 at 1:21 PM, katanafred said:

 I prefer disassembling old USGI magazines, cleaning them up, adding some protective lube, reassembling - then using a micrometer to compare the lip spacing against magazines that I know work in my particular gun. If out of specs, I'll use a magazine lip tool to bend and adjust them to match the measurements on my good magazines until I can get them to function properly.

Not a bad idea.  I've had plenty of success with eyeballing and kludging stuff over the years.

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  • 2 weeks later...
On 9/30/2023 at 9:26 AM, peter kohler said:

i bought one of the tools    ive done about 50 mags      i can lend it to you or you can just send me your mag and ill fix it

Thanks for that offer, it's very nice of you.

The problem is the shipping back and forth would probably cost the same as a new mag.

Could you please post a picture?  I'm curious what the tool looks like.

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On 9/29/2023 at 11:45 PM, deerslayer said:

Heres my tool.   Fairly eady to duplucate.  Concave convex jaws and a good grip will reshape the lips to the proper radius, and you can bend in or out.Screenshot_20230929_224240_Messages.jpg

 

what is the radius of a thomson mag's feed lips?  

what did you use to make those two forming dies on the end of the vice grips?

thanks

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Radius?  Your shooting .45 diameter ammo.  

 

Take a 1/2 drill bit through a thick piece of steel and section the result for the concave part.  Then cut a piece off a 29/64 drill bit for the round convex part.  Weld onto the vice grip.  

You want to weld convex piece first, then have the pliers squeezing a nice round magazine feed lip to align the concave piece properly before you weld it in place.

 

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