I sourced the Madsens from
here.
WW1 Russian reenactors with a Madsen:

WW1 German reenactor, portraying a soldier from one of the Musketen battalions. Note the distinctive ammo container.

How to propagate more Madsens (don't know if the technique works for 28mm versions)
here.
And an interesting perspective on 'firing' a Madsen:

This
features the Madsen.
Robert