Quote:

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The model GK was merely a stock and finish shape of the post-1952 Mannlicher – Schoenauer, made to European tastes. GKs share all the metal work with the "American" models MC and MCA, ... IMHO "GK" stnds for Gerader Kolben = straight buttstock. This stock shape is the distinguishing feature of the GK. Model GK rifles ... The MC and MCA stock variations were not even offered in Germany.

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Some images from (U.S.) Stoeger catalogs to help illustrate Kuduae's excellent narrative:

Here is a detail from the 1960 edition, offering the 'GK' option to American buyers:


More - for presentation purposes, I presume, or those who just can't get enough of embellishments:


These from the 1962 - note the descriptions of stock shape:




I have found no mention in the Stoeger images available to me of any 'NO' designated models. Whether (or not) Stoeger, as "sole importer", offered the 'NO' to the U.S. market or referred to them as such is unknown to me at this time.