I will have to take a closer look tonight, I appreciate the knowledge and comments here.
The two pictures I found of a M1912 Karabin show a slightly different trigger guard...
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Mine is more typical.

From Wikipedia they say "The M1912 carbine also featured an improved (strengthened) action which differed from the M/94 action on several points."

I dont know if this is accurate or pertains to this particular rifle, if so it is encouraging should I decide to try off the shelf ammo.

Is the 6.5 stamping on the barrel uncommon?
Wiki also says "About 1592 M1912 were produced in a special serial number range for sale to civilians".

Could this be one of those rifles?

Thanks...! John