Inherited a M1 - Curious what I have

[formulaforspeed]

my grandfather passed recently and I inherited his M1. I have done some basic research on the weapon but have run into some confusion.

I have identified the following markings:

The Receiver is stamped behind the rear sight with Winchester and 1296550

Left side of rear sight is stamped with what looks like a S

The front part of the receiver is stamped with "US Carbine" "CAL 30 M1"

screw at top of stock just to rear of reciever is stamped with "Rock OLA"

left side of the stock inside where the sling would go - it is stamped with RMC

on the right side of the stock it is stamped with RMC with what looks like a circle and cross cannons underneath.

There a 4 magazines all with different stamps (KSG, UI, BW, and MN)

What does this imply? is it a Winchester? Was it manufactured by Rock OLA or is it a rebuild with mixed parts - Based on some reading so far - Is it safe to assume it is a highwood?

I have posted pictures to the following website
Shutterfly

password is "milsurps"

any help would be greatly appreciated

Thank you
Charles

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