seems like the innovation on this one is the modified profile of the feed ramps , I dont think this has been published or referenced anywhere
would be important to see how that much magazine length can be accepted into the frame front and rear guide channels for the magazine
wow - very interesting 45 conversion
were the sample rounds you fired standard 45 acp cartridges - or were they some special handloads perhaps of less overall length / came with the gun ?
congratulations on your find !!!
Bill
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