Fell off the wagon with a K-31 and Argentine Mauser

[Calfed]

Yours appears to be a "Cavalry carbine".

The 1891 Argentine "Engineers''s carbine" looks like this

http://www.gunauction.com/search/dis...temnum=8123898

There was no conventional stocked 1891 carbine AFAIK...both of the '91's had the full length stock.