What exactly do you want to know?
There's a few different versions, each was basically a progression of the prior, made to be cheap and easy to make. Shoots 9mm, was copied by the Germans later in the war, lots of the parts between the models interchange.
Some came with brass bolts to ease mfg, but that ended up being scrapped as the botls wore out. They fire from the open bolt, early ones (MK II) were mostly metal, later ones MK V had wood furniture. You drop them they might go off, they were loved and hated at the same time.
The few we have run 500 to about 600 RPM, depending on body length and feed type.