@little maggie yes the M tips fit and should be fine.
All I can say is take care fitting any tip to a stem as some of them can be a bit tight, so a bit of lube and be gentle fitting them.
I think it's the O rings that cause the tips to be tight, I've rolled the tips in my fingers which pushes the rings into the grooves.
I took my little one to the local turning association's annual get together, not a happy bunny until we had a conversation with a lovely woman who was doing a demo there, The Tiny Turner.
She's incredibly talented and at 4'10" tiny, which pleased my 'not so little one'.
And because it's just not possible to visit these things and not buy something I ended up taking some acrylics home.
Had some more toothpick cases delivered and had a quick look at reworking the design from the original one I made.
Took a 2/3mm ball rasp to a Mi, traced out an image and set to cutting a frog. Which I filled with malachite.
Nearly forgot to say, my next batch of African Blackwood will be coming from these people.
http://soundandfair.com/fair-trade/