Help To Find OVER ALL LENGHTS of Lugers

[relichunter1]

Hi , I'm looking for "OVER ALL LENGHTS" of all Luger models .. I have measured my P08, 1940, maker 42, and I came up with 8 - 7/16ths", for OVER ALL LENGHT .. The Barrel is 4".. Can I assume that all I need to do is calulate Barrel difference and either add or subtract from this Base Number , I have of 8'-7/16ths ? for all other LUGERS .. EXAMPLE1) - I have a luger with a 4-3/4inch barrel , I come up with an OVER ALL LENGHT of " 9-3/16ths" , when I add the 3/4" difference to my 8-7/16ths of my PO8..EXAMPLE 2)Barrel lenght is 7." , I came up with OVER ALL LENGHT at 11-7/16ths"..I am assumeing that ALL LUGER recivers, are STANDARD/ HAVE SAME Lenght , EXCEAPT for "baby luger" model type .. I wonder if seven shot luger has same lenght reciver as other standard lenght recivers.. THANKS for any Help in this matter , in advance .. Thanks relichunter1