Measure the length of the cases and make sure they're the same length as 9mm Luger is supposed to be. Those look a tad short to me, could they be 9mm Luger's that were cut down and reloaded as 9x18 Makarov's?
Doesn't Springfield limit the two-piece assembly to 45acp only? And the joint is actually in front of the chamber as Walkalong says.
We got a jackass here in town who thinks that his 40S&W IPSC gun extracts faster if he reams his own chamber open. It just makes his brass harder to resize. Maybe that brass is just from some amateur with a damn Dremel who couldn't keep it out of his chamber. I wonder what he would do with an oversized rectal thermometer?
Or maybe, are there any full-auto with a tapered chamber for faster extraction? I don't know.
Original P85 barrels were of two-piece construction with the barrel and the square breechblock pressed together and then welded. It was a time-consuming and expensive manufacturing process. Current barrels are cast one-piece with broached bores. http://hunting.about.com/library/weekly/aast50rugerpistolsb.htm
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