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Old November 13, 2008, 09:48 PM   #2
James K
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Join Date: March 17, 1999
Posts: 24,383
First, the STEN was NOT made by plumbers and the tolerances for the barrel are the same as for any other barrel in 9mm Parabellum. In fact, STEN barrels are very well made and the gun is highly accurate, shooting around an inch at 25 yards when fired semi-auto from a rest.

The STEN fires from an open bolt, feeding the round into the chamber and then firing the primer as the cartridge stops on the chamber shoulder. Since the 9x18 would be too short (if otherwise OK), it would not stop at the time the bolt closes and would not fire. But the main problem is that the larger bullet of the 9mm Mak requires a (surprise!) larger case that will not fit into a 9x19 chamber. So you would need to either rebore and re-rifle the barrel and ream the chamber or have a new barrel made. Then you would have to open up the bolt face for the larger case head. I don't know if the blunt bullet of the 9mm Mak would even feed, but IMHO such a conversion (if you were serious) would be silly when 9x19 is a lot easier to get and cheaper than 9mm Mak.

Jim
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