Small Ordnance Bomb behind recoil plate

Do any of you remember this same bomb stamp that showed up on a few stocks back on the old Jouster?
I'm currently going thru a couple dozen stocks and happened upon this one. It's a type III OI with NO rebuild or inspection P stamps. It's been half way around the world. I haven't stripped the rack paint yet to see if the ordnance wheel is there.
Any one have any idea where these small bomb stamps may have been applied?

TIA
Charlie-painter777
https://www.milsurps.com/images/impo...DSC04068-1.jpg
https://www.milsurps.com/images/impo...DSC04069-1.jpg
https://www.milsurps.com/images/impo...DSC04070-1.jpg

I have seen this small ordnance bomb on half a dozen or so carbine stocks. Most if not all of them have been through rebuild. I think it is a rebuild inspectors mark. I have seen it on several RIA stamped stocks. I have never seen it on an orginal carbine, but I haven't closely examined hundreds of original carbines.

About thirty years ago I got an apparently unused OI M1 Carbine stock from Numrich. It had the RIA/EB rebuild stamp, the little flaming bomb behind the recoil plate recess, and no stamps on the right butt or elsewhere. Painter, what other stamps/marks do the stocks have, besides the little bomb, and what are the manufacturers?

I just finished stripping it.
Found a very faint RIA/EB stamp on the left. The pic above shows the OI in the slingwell. But NO ordnance Wheel. It had the rack paint job......BUT NO sign of them cross sanding before applying the rack number. NO flat spot either.
Maybe one like LittleCrane ran into.

Charlie-painter777

So maybe this marking pattern was something unique to new (or new old stock) stocks used as replacements on rebuild. Just a guess. Probably wrong.

Photos of the stock I got from Numrich -- think it was in 1981. It appeared unused, with only tiny handling scratches. Last year I put one of those CMP S'G' carbines in it.
https://www.milsurps.com/images/impo...5/RIAEB1-1.jpg
https://www.milsurps.com/images/impo...5/RIAEB2-1.jpg
https://www.milsurps.com/images/impo...5/RIAEB3-1.jpg