Now I have three

[painter777]

IS who made oilers and magazines was International Silver. After they got the OK to drop the Primary code.... I (for IS) I (for Inland)= II. They just marked IS afterward.
So a IS mag and oiler is fine for your RMC.
Here's a link to mag Id's: M1 Carbine 15 rnd Magazines

Here's a pic of a M2 trigger housing with the right wall cut away and left wall having the notch for a 9 spring. (I'm just trying to be sure your TH hasn't been modified,) I would expect your TH to be a narrow rear wall type II.
See here: The U.S. Caliber .30 Carbines - Trigger Housing Group


Your Frt sight is probably a TR, Look for a marking on your L flip leaf. Common staking by RMC......... Well, just look at these pics.

I think I found what you'll need. If not I'll follow up this weekend.

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[SRiverrat11]

Your Frt sight is probably a TR,

I looked closer at the frt sight there's an R on the right side too, but not the same lettering style as the pic you showed.

Look for a marking on your L flip leaf.

Just an "S" on the rear flip , there's no B-R at the peephole.

The ears on the frt sight have the line on each side of the "pin" hole, just like the pic you showed.

There's nothing close to an M-R on the band.

Riesch's 6th says, Unmarked MR, UR for 1,760,000(and up I guess) There's no comma after "unmarked" but you can't have unmarked and MR together, it doesn't make sense.

[SRiverrat11]

Here's a pic of a M2 trigger housing with the right wall cut away and left wall having the notch for a 9 spring. (I'm just trying to be sure your TH hasn't been modified,) I would expect your TH to be a narrow rear wall type II.
See here: The U.S. Caliber .30 Carbines - Trigger Housing Group

The link you put up tells me its the grooved wall. I saw no cutout on the right side for the M2. You know stuff I don't even know to look for.