Reprinted with permission:

English sucks for this.

What we know and what we do not know. 

To "know" that a gun is one of the PC carbines it'd probably have to be in a museum somewhere in the P.I. with a note that it had never left the P.I..  So let's skip that.  These are really the only guns that'd we'd "know" are PC carbines.  So that's right out the window.
To "know" that a gun isn't one of the PC carbines it'd have to fail an obvious test.  "Um, that has a 30" barrel.  It's an M-1896 rifle.  I'm comfortable that I know it isn't one of the PC carbines."

Your gun doesn't fail the "I know it isn't."

So then we're in, what in civil court, is called "preponderance of evidence."  In other words, taking in the entire holistic view of it, which way does the point go?  "Is" or "is not?" 

In looking at the pictures, not getting into pointless nonsense, my experience tells me:  "that appears to be a PC carbine."  I don't know that it is.  We already covered that though.  We also know that we know what isn't a PC carbine.  That one didn't fail that bit.  So, of all the Krags I've viewed in my experience, your gun is the only one where my brain said "that one appears to be."  That is the closest thing you'll get out of me on what it is.

Let me put it another way.

If I had to select from the following:
a)  School gun.
b)  PC carbine.
c)  Something else.

I'd go with (b).

No other Krag has had me go with (b).  It's always been (a) or (c).

Feel free to post that where-ever.  I'm not getting into a debate with people who have no idea what they're going on about though so they can howl at the moon over my determination.  I'm comfortable with it.

Keep the original pictures and the pictures of the gun you have; it'll explain the work.
Put the original cocking piece back.
Print this and keep it with the gun.  For what it's worth my view may have some weight in the claim that it's probably a PC carbine.

Cheers.
Joseph A. Farmer
28 January 2019

(con't)