TSO 9mm and .40 magazine differences

[Sk2088]

I haven’t shot my TSO .40 for maybe a year. Since I have a 9mm slide for it, I have a mix of 9mm and .40 mags. I want to make sure I am using the right mag for the right slide.

There are caliber stamped on the side of each mag. However, when looking at them otherwise, I can’t tell a difference other than the witness holes on round count.

After some more careful checks, I do see two different types of the followers as pictured.



The problem is I have both types that are stamped as 9mm or .40 inconsistently. Could I have mixed them up when I cleaned them before? Can anyone please shed some light?

[gunzip]

My 9's and 40's look just like to one on the right.

[Sk2088]

Thanks for the info. I wonder if they were made to be compatible between the two calibers on purpose.

[ViperM]

The one on the left looks like a 40 follower. Did you measure the feed lip distance?

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[Sk2088]

I didn’t measure but the two mag bodies are identical aside from the witness holes. It’s easy to tell that the two followers are different and they are both CZ factory mags. I was hoping people can help by taking a look at their CZ mags and see which one is for what caliber they have.

[tdogg]

I will have to find my stock followers.  I swapped the stock followers out for Grams followers and have extended base pads for competition.

I think I still have them somewhere...

Cheers,
Toby

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[Sk2088]

I figured most ppl have done that. Would appreciate if you can taken a look of your oem follower.

[gunzip]

left is 9 right is 40


IMG_0746_scaled_cropped by Jan & Glen, on Flickr

[Sk2088]

Both look the same to me. Is that right?
Thanks for the pic.

[gunzip]

They do indeed look the same.

 I never paid any attention to them prior to your post.  And it seems that the only thing that makes one magazine  a 9 and the other a 40 is the amount of bend in the magazine lips.  Either magazine will fit in both TSO's.

Due to this, I have filled in the caliber roll mark on each magazine with white finger nail polish.  I really hope this prevents a major problem in the future.

[Sk2088]

Gunzip, I think you nailed it. I looked closer at my mags. Clearly the .40 ones have wider lips than the 9mm ones. Measurements with a caliber confirmed this. But it can be seen just by looking at them. The 9mm lips are bent more than .40 at the opening.




Edit: based on this finding the one on the left of my pic in post#1 is also a .40. But it’s interesting that it has a different follower.

[tdogg]

Here is my oem 40 cal follower:


Here is a cz custom follower:


Here is a grams follower:


I don't recognize the left follower in your picture?  Not sure where that came from?

Cheers,
Toby

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[Sk2088]

Good to know all the differences. Thank you. I don’t know where I got that left one from but I know it shoots well so far.

[Bossgobbler]

The TS 9mm mags have ribs on the side,



 the TS 40 mags are smooth

[Sk2088]

Oh, how can I’ve missed that! It’s so obvious. Thank you very much for pointing that out.