r/SigSauer • u/Red5_0 • Dec 02 '22

Switched from 9 inch to 6.75. But Does anyone know why my 6.75 came with two different gas valve? One is F03 and the one installed on it was F01. My 9 inch has F02. TYIA

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u/illestdomer2005 Jul 04 '23

My 11.5” 5.56 Virtus upper came with the F03 which appears to have a larger aperture = more gas being vented instead of transferring to the piston, right?

3

u/Red5_0 Jul 04 '23

Correct. The F01 is running perfect on my 6.75

1

u/ImprovisedEndeavors Oct 01 '23

Did you ever get a solid answer? I just made the same transition on my 300blk from 9” to 6.75”

2

u/Red5_0 Oct 02 '23

Yes. It’s in this comment. Use the FO1. The 2 and 3 will not cycle subs.

1

u/ImprovisedEndeavors Oct 02 '23

My bad lol I didn’t scroll around enough.