Mike, Since the full serial number of your luger is in the "k" block on the front of the frame, it's possible that some field armour or repair technician added the suffix to the receiver to keep those parts together, when doing some kind of repair work. Lifer the 19 in 9x19 indicates the length of the case in milimeters. 9x19mm = 9mm luger, nato, etc. TH
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