1889 Swiss 4mm Flobert adapter

[Eaglelord17]

This is a photo I found online of the whole kit, it does look like it uses some sort of intermediate for holding the round. (it is the third picture on this page)

International Ammunition Association {iaaforum.org} - View topic - Lienhard 4mm for the Swiss 7.5mm rifle

It appears to just be a drop in kit, my biggest concern is just if there is any chamber modification required, as I wish to use my 1889 with some properly loaded GP 90/23 but am not willing to have my face blown off.

My understanding is this type of kit would be used to practice indoors down the hallway type deal, almost like a airsoft or bb gun with the proper backing.

Information

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[Patrick Chadwick]

Thanks for a great link! Very, very instructive.

It appears to just be a drop in kit, my biggest concern is just if there is any chamber modification required, as I wish to use my 1889 with some properly loaded GP 90/23 but am not willing to have my face blown off.

I don't think you need to worry. There was no chamber modification, the whole point being to preserve the rifle unaltered for normal full-bore use.
As to the missing portion: with a small lathe it ought to be possible to turn up the missing section and dimension it to use normal Boxer caps. If, of course, that sort of thing is legal where you live. It ought to be, as the principle is the same as used in the Pedersoli "White Hawk", the closest thing you can get these days to a parlor gun. However, there's common sense, and there are gun laws, and they don't always match up.