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This partial blueprint (for a prototype five position buffer tube) I drew up not too long ago might help you out a bit more.

Since you mentioned Ducati....my 2015 Hypermotard;

Nice! Here is my Panigale IMG_9403.MOV

I hate waiting for stuff, so much so that I rarely if ever go ahead and order anything that is backordered.

I have a first generation M3 with a shorten plastic pistol grip stock with limbsaver. Oh yeah I just remembered, you might be able to use a Stoeger compact stock in the M4 with the original buffer tube with some slight modification. You would need to make a 30mm (1-3/16”) counterbore.

Oh you mean that one. It is M21 x 1 -RH. it will have different fitments deprnding on the material

Yup. The Ducati factory in Bologna is closed the entire month of July. Found that out on June 28th when the motor in my Panigale blew up.