California echelon magazine base

So I just picked up the the new echelon 4.0c .. bought a magwell for it, but I can not find the extended magazine base for it. Nobody makes them, everything is for 15 and 17 round mags.. anybody have any ideas ? I’ve seen parts cross with the xdm.but idk if they would actually work ..any ideas or company names would be great..

I have checked

ndz

Tyrant

Springer Precision

Springfield

Patriot cnc

Amazon

Ebay

Taran tactical

Is the magwell from Springfield?

You could use a 17 round with a sleeve or add a weighted extended base for the magazine.

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No its a magwell from Springer Precision.

All the bases ive found have been compatible with 17 round mags but they all say “Does not work with restricted capacity magazines” or something close to that.

Magwell

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Is that due to the internal design of the magazine or spring?

It seems like its the design of the magazine. The base is different. I ordered some extensions from ebay, and they didnt fit. From what I can tell the lower rails/lips where the base is slides in is a different design than the bases.

This is the base I bought

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Could you use the full-size 10 round magazine with a spacer?

https://gunmagwarehouse.com/springfield-armory-echelon-9mm-10-round-magazine.html