Ordnance drawing number 5196466, dated 18 October, 1968 lists the following specifications:
Wire Diameter________ Approx. .036"
Number of Coils_______ 121
O.D. _______________ .256 +-.004"
I.D._________________ Not less than .179"
Free Height__________ 10.28"
Type of ends_________ squared and ground
FYI, 7312453 is the operating slide stop spring.