some data on the original keystone springs

[RCS]

I have been collecting data on these keystone springs foe awhile. While some springs might stretch or shrink, the number of coils remains the same.

1) 19 1/8 inches 289 coils round body FR
2) 19 1/8 inches 280 coil comp spring
3) 18 3/4 inches 280 coils comp spring
4) 19 inches 283 coils comp spring
5) 19 3/16 inches 289 coils round body
6) 18 7/8 inches 281 coils round body
7) 18 3/4 inches 280 coils round body
8) 19 1/8 inches 286 coils unknown
9) 18 3/16 inches 275 coils round body part of spring broken
10) 18 1/16 inches 56K rifle

Some collectors have the theory that a longer keystone spring was produced when used with the round body follower rod. Nothing documented to date.

[Flightrn]

Good Day All,
I was cleaning my early M1 and inspected my keystone main and compensating spring assembly. It is 18 15/16inches, 283 coils. The comp spring is 53 coils. They are not original to the rifle.
Regards,
Michael

[RCS]

Can you post additional photos of your rifle ?