carbine flat bolt marked h.u.

[noonespecial]

hi I have a flat bolt marked H.u. under the left lug ,could someone tell me who the manufacturer is,and who used it? thank you in advance, John

Information

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[ScottR]

.U. is for Underwood, after carbines went through the arsenal rebuild program parts were mixed.

Scott

[BrianQ]

Howe Machinery