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...  |
There is/was a 4mm M20 cartridge. And it's centerfire. It has no powder i'ts propelled by primer alone.