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Blank: These are either made by the
manufacture who made the M4, or
by some unknown company.
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Numbers: One or more numbers are usually
found on the face of the plate, and it is not
known for certain what the numbers mean.
The current "best guess" seems to be that
they are batch or heat treat numbers.
- Gary Cunningham |
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SP: This was the code for Standard Products.
It is actually an "S" with a "P" in it.
Thanks to Thanks Frank
Trzaska for the info
The bulk of the butt plate assemblies were
manufactured on subcontract to the M4 makers
by the Standard Products Company of Port
Clinton, Ohio. . - Gary
Cunningham |
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"H" inside of a shield:
It was the code for the
Hemphill Company of Pawtucket Rhode Island.
It is a pretty rare marking. I've been told it was
seen on Imperials
Thanks to Frank
Trzaska for the info |
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I inside of a circle: This is
the butt of the circa
1954 (may be slightly later) contract by
Imperial. I am not sure if the circled I means
Imperial or not, but have only seen it on Imperial
made bayonets of this second contract period.
-Rare!
I have in my collection a Camillus with this
stamping. - Bill Krueger
Thanks to Frank
Trzaska for the info
Thanks to Lou
Cioffioni for the picture |
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Ordinance bomb: So far I have no clue why it
was put on the latch plate (All other pieces had
it near the manufacture stamping). The only
piece I've seen it on is the AKI M4 with the saw
tooth. Speculation was this was an after war
piece for the civilian population. I am not certain
if its on the none saw tooth AKI M4 at this time. |
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X: Believed to be the Marking for the Camillus
Reproduction Factory Second M4. Stopped
being made in the 90's. I am working on
acquiring more info about this.
Factory Seconds were sold at Smokey Mountain
Knife works.
Thanks to Lou
Cioffioni for the picture |
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The latch plate has a dimple on it (possibly
the result of a hardness test?). - Gary
Cunningham
Seen on Bren-Dan, Conetta, TMN, PAL, Utica, ROK,
K-M4 |
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This latch plate has two inlayed circles on either
side of the tang.
Seen on Kingsfolk Inc |
N/A
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Kongsberg arsenal mark. |