Quote Originally Posted by John Beardicon View Post
An M1917 magazine spring has C-shaped bends and is marked "R", "E", or "W". An M'03-A3 magazine spring has U-shaped bends and is either marked "R" or is unmarked.

Hope this helps.

J.B.
John, isn't it also true that the Remington "R" stamp on the M1917 spring has serifs, and the "R" for the M1903A3 spring does not? This has been my observation, in addition to the shapes of the "kinks." Thanks, and best regards, KarlKW