When was the Hatcher Hole introduced?

[RBruce]

Was the Marine Corp the first to implement it?

Information

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[RBruce]

Marine Corps implemented it first

[Mike D]

I have a few references that say 1936. Canfield says the Army mandated it in July, 1935. The U.S.M.C. followed a short time later.

Also around this time the bolts' gas escape hole was enlarged.

[jarrodeu]

Would it be possible for the gas escape hole on the bolt to be enlarged but not have a hatcher hole put in?

Jarrod