Quote:
Originally Posted by sheepherder
Very interesting! These sub-caliber conversions lock on the front sight base rather than a chamber lock like the .22 Erma conversions (stepped & flanged barrel insert).
George, is the 4mm cartridge center fire??? I suppose it would have to be... 
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Yes, the single cartridge is loaded by hand and extracted with a rod run through from the muzzle. Here is a period description.
George