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I know that on the 2015 rMPB the SSD is replaceable. You can even get a recent Samsung SSD and install it (provided you have the right adapter)

https://medium.com/@MaestroVolis/samsung-960-pro-in-15-macbo...

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I ended up doing this last year. I bought a Sintech adapter and a Toshiba XG4 SSD for my 2015 15” rMBP. It works just fine but the battery life ended up being terrible compared to the stock SSD. I was getting around 60% of the battery life of the stock SSD with the XG4 + adapter combo.

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