Short stroking

[finloq]

Fired my M1 for the first time today. It would not eject or strip rounds. I created some light loads and assumed that was the problem (gas cylinder and port seem clean, op rod slides cleanly without spring-tilt test). I just checked the new stainless steel op rod spring that I had installed prior, compared to the USGI spring that was on the rifle, when I got it:
Stanless - 20 1/2"
USGI (used) - 19 3/8"

Loads:
147gr. in front of 47gr. IMR4895
168gr. in front of 45gr. IMR4895

Loads or spring?

With 3 clips fired, it cycled once.
When operated manually, no problem ejecting a spent round or stripping a new one and chambering it.

Information

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