I think this is a custom conversion by a Canadian ? gunsmith post WW2 1960s ? and the split upper asy is a sort of floating chamber to allow the rear section to reciprocate kind of like a 22 ace colt 1911 type pistol.
someone recently offered a front barrel + front section of slide on an auction site but it was a 4" bbl and had the same step down barrel which locates the 22 cartridge edge so it gets rim struck by the standard luger firing pin
I have somewhere in storage what is supposed to be the original blueprints and some original pictures etc from the gunsmith whose relative sold the package on ebay about 10 yrs ago
I think one of the older luger books has a picture and some disasy pictures of a sample - perhaps the Reese book
perhaps value of $1500 to someone who likes the design - I think the appearance limited the appeal and sales of this conversion
somewhere I think there was a magazine article that included that the pistol did function reasonably well
please add some disasy pictures of the upper asy and also the frame spring area with grips removed as the actual mods made to the breechblock and mainspring would be interesting
the donor luger was likely a parts quality gun and a shooter quality gun of the time
thanks
Bill
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