Mystery residue marks on my M1 carbine

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Snowdog

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After a long overdue cleaning of my Universal M1 carbine, I noticed something that I hadn't noticed before..
Inside the stock where the "tappet" on a GI M1 would usually reside, there is a buildup of residue (as the picture below illustrates).

I was under the impression that in order to cut production costs, the commercial Universal M1 did not feature a tappet-assisted recoil operation, but with the redesigned bolt carrier, was recoil-operated only.
There is something that strongly resembles a gas port/tappet housing with an immovable 3/8" diameter object resembling a piston that looks to extend out of this housing by 1/8".

Is there any knowledge of Universal M1s that were assembled using barrels with modified (read "disabled") tappet systems? Another clue that leads me to believe that this indeed may be what it is would be the more than usual residue build-up around the area of what would normally be the tappet housing (bottom of barrel in that location, recoil spring guide rods, etc).

This is one of the better trades I made, having procured it several years ago by the trade of a Marlin 60 (since replace with a newer model 60) with old Redfield scope and $50 cash.
This extremely accurate carbine has never jammed out of the 400 rounds of PMC and Armscor FMJ I've put through it and is quite possibly the cutiest shoulder-fired firearm I have.
This carbine has sparked my interest in the M1 and someday I'll look into buying a GI issue. However, right now I'm looking for answers for the one that I do have. Is this a modified/disabled tappet system showing signs of a break down? Thanks in advance.

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Maybe your gas cylinder nut is dirty and/or needs to be tightened/replaced?

Don't use solvents (unless brake free), but clean it off good... piston should slide forward and back (audible) when tipping the gun up and down.
 
The Universal carbine is gas operated, same as the military carbine. You're getting some residual gas blow by. I don't know whether that's normal or not.

Don in Ohio
 
If what Backwood says about the Universal action is true, that gas mark is normal and inherent in gas actions. Even the Mini-14 does this but that has a liner to protect the wood from overheating.

I'm not sure about Universal redesigning the action to be pure blowback. That would require a substantially heavier bolt (and with that, a heavier recoil spring for sufficient strength to return it).
 
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