Qestion About M1 Front Handguard Ferrules

[Normanclature]

The front handguard ferrule on some M1 handguards has a small vertical indentation (looks like a - )which, when viewed on a rifle, is about halfway between the bbl and the gas cyl. Why is this on some front hg and not others? Does it indicate a particular manufacturer or a production time period? If so, what manufacturer or time period?

Thanks in advance for any replies.

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[ROCK]

I have seen those indentations on original post war SA rifles.

[ROCK]

I should add that I have seen discussions here about Winchester front handguard ferrules having these indents. I don't have any original Winchester M1's so I can't tell you for sure from my personal observations.